[header] How to act around people who don't like you if you don't like them [title] Figure out why he bothers you. [step] We all have co-workers that we dislike. The self-promoter, the know-it-all, the duty-shirker, the gossip, the golden boy. 
If you feel your ire rising, try to figure out why you dislike the person. Once you pin this down, you will be able to better manage your approach.