Part of the fun is getting dragged into it sometimes, and then bailing before the bans and warnings start flying and talking the moral high ground, I've not quite perfected the bailing out part yet.
First post of a mod is the early warning...
Make sure you 'Like' that post, then a few more of a similar vain, while gently still needling the more extreme elements.
Casually post something in a completely different part of the forum, even better if it's a serious topic.
Wait 10 minutes and return to previous thread and observe the aftermath. Then contribute with something to the effect of 'can we get back to talking about Everton ffs'*
*Nobody wants this, but you've got to play the game.