Stalking, repeat profanity, revealing personal data of other posters and such, I can see banning. But, there should be a warning first.
I quipped about Woolybugger's forum name (should sheep worry?) which, is a double entendre playing on old English terms for rather nasty behavior, including the charge, "Extreme worrying of sheep."
The lefties scream bloody murder when I use the Guy Fawkes mask as an avatar or the glowing skull of an online comic book (called me a NASI). Actually, the character is a good guy who reanimated himself to help his daughter. Likes to smoke cigars, but being a skeleton, has problems inhaling.
I've commented on Bestworking, Firenze and Semiannualchicks avatars that they were cute. Not looking for a date, or anything. Just a friendly comment.