Something Awful is great, at least partly because the paywall (if you aren't logged in you see a very restricted view of the site, with a profanity filter on to

Something Awful is great, at least partly because the paywall (if you aren't logged in you see a very restricted view of the site, with a profanity filter on top) and $10 USD joining fee combined with the active moderation team is very effective at stopping rule breakers - you can rejoin (for another $10) if you get banned, but if you continue to be odious you will eventually get permabanned (which I think extends to preventing any credit cards associated with you from purchasing new accounts). There are a few serial pests who keep trying regardless, but they number in the single or low tens of people.