Let's try this. Say your name is BOB, and you hate, HATE JOE. If JOE starts a thread, DON'T respond to it. In fact, don't even read it. Is that so hard? Don't even look at it sideways, because chances are you're going to want to post something to either contradict him or harass him to the point of insanity. Now JOE, you should also not respond, look, click, sneer at BOB's threads. That way, the universe can continue to expand and not collapse into itself.
Done and done.