Johanna, it's very simple.  If you don't want to be rude, don't be.  If you don't want to pick fights, don't.  If you want to play nicely with the other members, do so.

But if you DO insult other members, call them names, question their sanity, tell them they sound like they're incoherent from chemotherapy, or that they need psychological help because their belifs differ from yours, do not expect the rest of us to lie down and take it passively.  I am not a doormat, and having a random stranger type words at me for 48 hours is not remotely going to "wear me out".