How Do You Deal With People You Don't Respect?

Lately I've run into a couple of situations where I have to deal with persons I don't respect in some way shape or form be it professionally, theatrically, or personally. When I get around these people, Evil Nelson comes out . I get really short with them, and with my body language make it very clear that I am annoyed by them. I then get angry at myself for being a dick about it. They have some redeeming values otherwise I wouldn't be around them, but I am at a loss as to how to figure out what about me is making me feel this way. How do you guys deal with it?

Currently listening : Immigrant Song By Led Zeppelin Release date: 11 June, 1992