Do they get in the way of you doing your job? If so, then you need to speak to your manager. I'm getting to that point with a guy I work with. He's a total A$$. He does not like me and I do not like him. ... AT ALL! Well when he's having an off day he'll refuse to talk to me. He won't tell me NECESSARY information that I need to do MY JOB. That is where I draw the line. He is wrong. Its fine that he does not like me. I don't care. But when he does things that put my job on the line, then that's another story altogether.
Today he is being a HUGE JERK..... per usual... not telling me when he was going to lunch, not asking about the lunch schedule. We all switch up lunches b/t 12, 1230 and 1. We all used to go at 1. Now me and the other girl offer to do 12 and 1230 all the time, but he NEVER does. When my boss tells him to do 12 he will not tell us. He's mad that he can't have 1. He's the most ridiculous, idiotic, ignorant frustrating person I've ever met. Every single day is a challenge to work next to him. I DESPISE HIM so much... I go home every night and need to vent to my BF before I can calm down. I need to get out of here.

It does not help that I do not love my job either!!!