[NhanH]

Reddit is already mainstream by any sense of the words. The reason it's full of hateful, annoying etc. people is because that's how anonymous human behave. Reddit is not a super secret group that only hateful bad apple knows about. You can try to clamp down the bad content, but alienate the user base will end up badly because there will be no one left to join.

[saint_fiasco]

>because that's how anonymous human behave

You mean pseudonymous humans? Reddit has a karma system, people can see your comment history and so on.

[Crito]

Are websites that are known for being more anonymous than reddit known for being more or less abrasiveness than reddit?

In my personal opinion, they are less abrasive. But I think I am definitely in the minority there. I think that anonymous sites are popularly known as more abrasive.