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Contrary to popular belief, you don't have to be mean to someone you hate. Disliking someone doesn't mean every interaction you have with that person has to be negative or rude, in fact two people can have a mutual dislike for one another and still respect each other.

There’s a middle ground. I’ve had interactions with people whom I dislike and I’m not nice nor am I mean. To me “being nice” means I’m going out of my way to accomdate their wants. I see no reason (outside being paid for it) that you would do this for someone you dislike.

Maybe you don't have to go out of your way... just be polite. The actions of others shouldn't change who you fundamentally are as a person