It wasn't so much a single comment that went beyond the pale, but his behavior over a period of years. The thread that was the straw that broke the camel's back (and the banning) is here (http://inverarity.livejournal.com/91506.html?thread=632946#t632946).

fpb is the sort of person who will walk into your living room, drop his pants and shit on your carpet, and then scream at you that it's your fault.