8 mistakes you should never make when dealing with a coworker

Tina Fey by Tina Fey | January 21, 2026, 4:41 pm

Navigating office politics is like walking on eggshells; one wrong move can lead to a whole lot of trouble.

Dealings with coworkers aren’t exempt from this rule, in fact, they require tact, diplomacy, and a keen understanding of personal boundaries.

Make no mistake about it – how you interact with your workmates can make or break your work experience, and becoming an office pariah certainly isn’t something you aspire to.

The good news? There are very specific don’ts when it comes to interacting with coworkers. Armed with this knowledge, you can circumnavigate potential landmines and work harmoniously with your team.

So without further ado, let’s dive into the eight mistakes you should never make when dealing with a coworker. Trust me, avoiding these blunders might just save your career.

1) Crossing personal boundaries

Picture this: You’re amidst a discussion with your coworker, and suddenly, you accidentally touch upon a personal ordeal that clearly makes them uncomfortable.

This is a common yet fatal mistake that many make.

We tend to forget the importance of professional boundaries in a relaxed work environment. Be it casual banter or the genuine concern for a colleague, it’s crucial to know where to draw the line.

Crossing personal boundaries isn’t merely about discussing private matters, it can be as subtle as interfering with their work method or hovering over their workspace.

Remember, respect and maintaining a professional distance is not just courteous, it’s the foundation for a healthy working relationship.

Learn and understand your coworkers’ preferences and respect their professional boundaries. This simple step can help foster a stronger, more respectful work environment.

Avoid this mistake, and you’re well on your way to thriving in your workplace.

2) Heading into conflict without a game plan

Let me share a story from my early days of working.

I had a coworker – let’s call him Jake. Jake and I couldn’t see eye to eye on anything. One day, frustrated, I decided to confront him, intending to resolve our issues. I stormed over to Jake’s desk, pointed out everything I thought he was doing wrong and, in my mind, expected him to then magically agree and everything would be resolved.

What actually happened? Jake got defensive. He brought up points I wasn’t prepared for and countered my arguments in a way I hadn’t anticipated. Our conversation quickly spiraled into a heated argument, becoming a spectacle for the entire office.

What did I learn from this experience? Never enter a conflict without a game plan.

Before you address any issue with a coworker, take the time to think things through. Consider your coworker’s potential reactions and prepare yourself to navigate the conversation calmly and objectively. Remember, the aim is resolution, not wining an argument.

Avoid making the same mistake I did. Proceed with a plan. It makes a difference, and I, for one, can vouch for it.

3) Lack of communication

Communication is the backbone of any functioning team. A study by Queens University of Charlotte found that 3 out of every 4 employers rate team work and collaboration as “very important”. Yet, nearly 39% of surveyed employees believe that people in their own organization don’t collaborate enough.

Withholding information, not expressing your thoughts, or neglecting to provide feedback can create a minefield of misunderstandings and missed opportunities.

When important details are lost in translation, it can lead to mistakes, conflict, and decreased productivity. On the other hand, open and consistent communication can build trust and promote a positive work environment.

Here’s the thing: Communication isn’t just about speaking; it’s about listening too. When you actively listen to your coworkers, you show them that their thoughts and opinions are valued.

Avoid making the mistake of poor communication. Make an effort to keep the lines open, and you’ll see the difference it makes in your daily interactions.

4) Making assumptions

Have you ever heard the saying, “When you assume, you make an ass out of u and me”? Cute, right? But there’s a lot of truth in that playful jibe.

Assuming things about your coworkers’ perspectives, work habits, or intentions could land you in a sticky situation. At best, you may be slightly off the mark; at worst, you could catastrophically damage a professional relationship.

Think about it. Maybe you attribute a coworker’s silence in a meeting to disinterest, when they’re actually processing the information. Perhaps you assume a colleague is lazy because they leave work on time every day, but they’re actually efficient and manage their time well.

When we base our interactions on assumptions instead of facts, we risk fostering misunderstanding and conflict. Instead of assuming, cultivate open dialogue, ask questions, and seek to understand.

In many cases, the reality may be far different from what you perceived. Nix the assumptions, and you’re already on a better path to interacting successfully with your coworkers.

5) Not showing empathy

In the hustle and bustle of ticking off to-do lists and meeting deadlines, it’s easy to forget that we’re all human beings navigating this dynamic landscape called life together.

We can get so focused on our tasks that we forget to acknowledge the emotions, challenges, or victories our coworkers may be experiencing. Empathy, the simple act of understanding and sharing the feelings of another, can often take a backseat.

Yet, empathy can make all the difference in our interactions. It bridges gaps, fosters trust and camaraderie, and truly humanizes our professional relationships. Whether your coworker is dealing with a challenging project or celebrating a significant milestone, showing that you care will not go unnoticed.

When we show empathy at work, we send a powerful message: we see our coworkers not merely as cogs in a corporate machine, but as human beings. Avoid the mistake of ignoring empathy; it may be soft skill, but its impact is significant. Treat your coworkers with understanding and kindness, and you’ll find it reciprocated.

6) Forgetting to value their contribution

You know, there was a time when I was so swept up in reaching my targets and meeting my deadlines that I didn’t acknowledge the work of a colleague who consistently offered to assist me. They were always willing to lend a helping hand, yet I barely thanked them for it, always in a hurry to move on to the next task.

It took a while, but I realized that I was taking their contributions for granted. It dawned on me how integral they were for our team’s success and my own achievements. Recognizing and appreciating their efforts have made all the difference in our professional relationship.

Gratitude and respect go a long way in cultivating a positive workplace culture. When you value your coworker’s contribution, it not only acknowledges their efforts but also motivates them to continue giving their best. It’s a small gesture with a big impact.

Don’t make the mistake of forgetting to appreciate your coworkers. A simple ‘thank you’ or ‘great job’ can uplift their day, and in turn, improve your relationship with them.

7) Neglecting to give (and receive) feedback

Feedback is a key ingredient for personal and professional growth. Giving and receiving feedback can be challenging, but dodging this crucial responsibility is not the answer.

When shared constructively and received with an open mind, feedback can bring about improvement, innovation, and foster stronger professional relationships. Ignoring this unintentionally sends a misleading message that you are either indifferent to your coworker’s efforts or hesitant to express your thoughts.

Practice sharing feedback that is specific, actionable, and delivered with respect. And when you’re on the receiving end, take it as an opportunity to grow and learn.

Remember, feedback is a two-way street, and utilizing it effectively benefits everyone in the long run. Make sure you don’t make the mistake of neglecting it. Strive to create a culture where giving and receiving feedback becomes a norm rather than an exception.

8) Not treating them as equals

The golden rule of any relationship, professional or otherwise? Treat others as you want to be treated. No matter their role, expertise, or experience, every coworker deserves to be treated as an equal.

Undermining a coworker, whether overtly or subtly, can damage professional relationships and create a toxic work environment. Respect is fundamental and should be extended to everyone you work with – it’s not only about kindness, but also about acknowledging the value each person brings to the team.

Don’t make the mistake of treating your coworkers as anything less than equals. When we give and receive respect, we rise together, fostering a more harmonious and productive work environment.

At the end of the day, it’s about harmony

Interactions with our coworkers encompass a significant part of our lives. After all, we can spend around a third or more of our days working together.

Surprisingly, these interactions aren’t just about the task at hand, but they also shape the workplace culture, team dynamics, and ultimately, the overall success of the organization.

Whether it’s practicing empathy, giving and receiving feedback, or avoiding presumptions, each of these elements harmonize to paint the bigger picture of a healthy and efficient work environment.

One of my favorite quotes, certainly apt here, is by Phil Jackson, renowned basketball coach, who once said, “The strength of the team is each individual member. The strength of each member is the team.”

By avoiding these common mistakes, you can contribute positively to your team’s strength, fostering relationships built on trust, respect, and open dialogue. Remember, the goal isn’t just to coexist but to collectively grow and thrive.

So, as you reflect on these pointers, take a moment to consider your role and your interactions within your team. Because, like a well-tuned orchestra, when each player hits the perfect note, the result is a symphony of undeniable harmony.

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