What would you do if you had a guest in your home who . . .

If you had a guest in your home whose behavior was such that he had already been banned from several parts of your home, who offended several of your other guests and who, despite your giving him a room of his own at no charge, called you out repeatedly and criticized the way you ran your home, failed to heed your warnings or rules time after time and ultimately threatened to sue you and other guests unless the other guests stopped giving him a taste of his own behavior, what would you do?