People who can't drive.
People who let other people do their thinking for them. And make very poor choices picking those other people.
Rich/beautiful/talented people who whine that they have problems just like everyone else. Except for, you know, the problems that they don't have that everyone else does.
People who think that the music they like is "good" and the music other people like is "bad". And think that people who like that "bad" music must just be clueless, because it's inconceivable that they might just have different tastes.
People who like to draw lines but aren't artists.
People who don't understand that communication requires feedback from one's audience.
People who can't do math arguing with people who can. About math.
People who don't know the difference between "different" and "better". (But in their defense, people like that are in fact better than "smart" people. Or different. Whatever.)
People who are better than me. Or different.
People who think that someone else's bad behavior justifies their own.
People who are just visitors insisting that you need to redecorate your house.
People who can't figure out whether I'm being serious or not. Or might be being serious. Or not. Or deliberately leaving it vague as to whether I'm being serious. Or not.
People who complain about other people.
People who don't get irony.