Reddit may have some high profile cases where they banned a subreddit, I find Reddit rather tolerant. For example, there are several longstanding subreddits dealing with kinky sex, drugs, and kinky sex on drugs. Opposite and controversial viewpoints have their subreddits: prolife and prochoice, progun and guncontrol, vim and emacs, etc...
Most bans are for really terrible communities, and yes, for a few of them, I think it went a bit too far, I wouldn't have banned the_donald for instance, despite not wanting to have anything to do with them. Really, they do the minimum acceptable for a mainstream service.