People who are dumb and proud of it
My Pet Peeve is people who are ignorant, uneducated, bigoted, trashy, red-necks and are proud of the fact that they "don't know nothin' ". This seems to be fashionable right now. They try to bring down everyone else to their level. They absolutely hate people who want to try to learn or do better. If that is what they want to be - I think that is great (not really, but I think they have the right), but don't hate people and try to destroy others because they think and care about issues that you are clueless about.