I would say the general IQ of YouTube users is lower than other places, to begin with, but that’s what you get when you have a broadly-accessed site like that. Not to mention, the majority of YouTube videos are dumb, at least in my opinion. Then you add in the fact that people tend to be way ruder, meaner, more crass, and insulting when the internet separates them from other people.
All the more reason to invent a key that, when pressed, punches the other user in the face.