could a "people person" sometimes not like people

Even though I am a pretty friendly person, I went into social work for pete's sake, sometimes I just don't like some people. You might be surprised who; it isn't always your garden variety jerk.
It become particularly challenging when the person you dislike is someone you cannot avoid seeing or running into. This is where my neurotic attempts to justify my dislike of them kicks in; I start to list all the reasons in my head why I dislike them, and thus, why others should dislike them too. I begin to get a superiority complex; compare myself to them and how they do not major up to my awesomeness.
What a load of crap, you know?
Anyway, sometimes people do things or act in ways we do not like. We need to get over it; our disliking of them is our responsibility, not theirs. I am not saying that it is not okay to dislike someone, or that we have to find some way to like everyone. Just own the fact you don't like someone, then move on. Of course, remembering the Golden Rule: "do unto others...."
Life is too short to get all in a snit over stuff like that.