I'd say I've never seen a community of substantial size where assholes did not try to ruin it. /r/askscience has fantastic mods and there are many smaller subre

I'd say I've never seen a community of substantial size where assholes did not try to ruin it. /r/askscience has fantastic mods and there are many smaller subreddits like /r/london and /r/unitedkingdom where it's too small to attract anything worse than a mouthy ukipper.