I find the opposite. I've been pretty lucky with forums. Been on comic book forums (you'd be surprised how civil they can get), writing forums.... This one's been good to me, but even here I've run into some trolls or users who aren't trolls but have short tempers. The only really bad one I've been on was a forum for a comic strip where I signed up, made a suggestion, and got lambasted by all the starry-eyed fan-bots. Can't remember which one it was, but never suggest that a weekly comic strip can pick up the pace a little.
This one's always my home, though. Ten years!
I missed our anniversary here! Can you guys forgive me? Fine. I'll sleep on the couch tonight.