A majority of the people at my school are border-line jerks, at least. Most of them are really just numbskulls who aren't very tolerant of others. I generally consider people who have no tolerance for certain groups of people, specifically racists and homophobes, jerks. Of course, there's a big difference between disliking a group of people and not tolerating them.

I can't come up with many specific examples. I can be a jerk at times because I tend to snap at people and become easily aggrivated by stupid little things when I'm having trouble with my moods.