I got banned from a site once. I have Cancer and they were trying me on new pills all the time, at the time, and I had a few 'reactions' shall we say and during one really bad one, I had a complete temper tantrum. (mental meltdown) That was a bad period of my life, searching for pharmacutical solutions to my problems. (combining Prozac and Wellbutrin with painkillers and neurological meds was the worst idea my ex doctor ever came up with)
I am since forgiven on that site though as it was a 'temporary' ban.
Can you imagine telling off all the people you don't like and ones you even like, at a site? I mean really telling them what you think with no inhibitions?