I completely agree. Don't like it? Talk to them like a civil human or ignore it. You can't augment everything in the world to your liking just because your brain might not like an idea (no matter how good you feel your idea is).
They will be around regardless of subreddits/bans, etc. no matter how much one may hate an opinion, one cannot stop it from existing using censorship. If anything it's just fuelling flames.
Do you think it's accurate to define the forums that way? Some people just use em all, I personally don't think these places/people are so one-dimensional, no matter what their ugliest opinions look like. Actually I think the problem with many subreddits/verses (in particular those about personal views like atheism/srs/fph) is the flat and incomplete view of who the users really are.
Hmm I think people who are creating new discussion-based sites are learning from reddit's mistakes/successes, and are creating better places that know how to combat groupthink/hate-mongering/spam while allowing great content to float to them top. In that way, reddit was a stepping stone for better things to come. I definitely felt like the vibe of indignation and ease of burying other people's opinions made me less friendly towards other people.