Just discovered this section of the forums... makes for interesting reading!
This fella was on today, and was being very vulgar: profanity, racist comments, and lewd remarks. I asked him a couple times to please tone down the language, and got the "are you admin? then [expletive]" response that seems typical from reading other threads in here.
At one point a BFM (Sub Zero I think) came on, and 'Zim' instantly became very civil and even polite - even complementing others, etc. As soon as the BFM member left he started back up again, which -- to me -- clearly indicates that he fully understands that it's not appropriate, and that he's perfectly capable of playing within the rules.
I know you guys have to see it first-hand, and unfortunately I haven't figured out the screen-capture yet, but I wanted to give a heads up. Thanks for listening!