Originally Posted by slapstick

I doubt this would work for you, but I go through the same deal in my daily life, people just being general cunts and not being able to get it out of my head.
do what I do: fantasize about killing them. I don't mean thinking "man, it would be nice if they died." actually think about it, choreograph it. would you put a hatchet in the back of their heads? beat them to death in the middle of a crowd? put some effort into it! its your fantasy, use telekinesis, or that awesome sword you saw online to off them in creative ways.

or go for long walks and listen to music. these work about as well for me, and usually do them at the same time.