Users who insult fellow chatters and continue to harrass individuals who show a desire to not talk to them by exiting and entering to blank ignores tend to loose chat access.
A night back you managed what is described above and were banned. We always regret doing such, but realize that chat is not for everyone, and occasionly need to help a member with issues they might have through removing the source of the problem. In this case chat access.
And before we do the "I didn't do anything" dance. I have screen shots of the behavior. You were recorded in action.
Myriads