Employed people of Reddit, what’s the one thing you’ve been holding back on saying towards your coworker?

Nothing really. Learning to act as a professional is a lot more than just watching your mouth, eventually you will be able to process your thoughts about them, things you don’t like them doing, and confront them in the appropriate way, and have the situation corrected. If something is important, I will address it, and if it is not important enough for me to address, then it is not important enough to take up space in my head