I once got banned from 4chan.
A few times, i try and keep my cool though as it really dose no good. Only time i can recall on here was when i posted about my guns and i got some mixed views on gun rights and such. long story short its not worth anyone's time to argue on the internet. Not many people will change there opinion because of what some random person says online.
I tend to stay away from forum 'drama' as I don't see the point of it. Neither side ever admits defeat, so it always spins out of control into insults and arguing for arguing's sake.
But I do remember two years or so ago when I made a blog here about me quitting why WoW, and some random user spammed the blog with insults and accusing me of this and that. I have no idea why, I guess he felt insulted or something because I was quitting. I didn't even complain about the game, just my inability to play it in a moderate way. Don't know if you can call it drama, since I just ignored him, but it's the closest I've come to it that I can think of.