Comics. I feel like it's probably just a bunch of elitist losers who would get angry because I don't know how fast Superman can fly from the Earth to the Sun.
Gaming is also pretty bad because there are so many people who try to convince themselves they're great for being able to play a game well, as well as ridiculing others for not being able to play the game well.
Anime is mostly cool, but there are a lot people with very strong opinions.
Sports is bad. Lots of people are very close-minded, supporting "their team" regardless of how successful they are or aren't. Really makes no sense to me. They're also very hateful toward supporters of other rival teams, which is just dumb.
Music is filled with mountains of close-mindedness. People actually believe the music they listen to is good, and that the music they don't listen to is bad.
A lot of people on this site are like this. You'd think that being a quality person with an open mind would be the highest priority, but people would rather be "right". Rather silly, if you ask me.