With the exception of /r/fatpeoplehate, those aren't the subreddits I think of when I think of hateful subreddits, as they are mainly low-subscriber fringe groups. The same sentiment that FPH had lives on in other "angry" subreddits that reach mass appeal (like /r/justneckbeardthings, and much of /r/blackpeopletwitter).

I think a sentiment analysis of posts from the major subreddits would be an interesting read.