People who...
* flick their cigarette butts out the car window, especially if you hit my car with it. If you're willing to smoke the things, you can deal with them in your ashtray.
* force their way into a lane at the very last moment when their lane ends (merge) and slow down traffic rather than merging when there's room.
* just think the rules of common courtesy apply to everyone but themselves.
* earn waaaaay more than they're worth (pro sports personalities, corporate officers, celebrities).
* talk a lot of $hit on this board when they'd be too big of a pu$$y to do it to another person in real life.