Please help!

If you were to have a rather outspoken and controversial member on this site who you then decide to "punish" by banning him for a while, would you consider it absolutely fair/necessary/downright irresponsible/ silly to change this persons avatar to read..........

"I am a pain in the administrators ass and have been banned for a while"

Is this maybe harassment or maybe slander as this person has no way of defending themselves? Is this fair behaviour from the administrator - after all it is their site?

Any other comments?

By the way, what is in contention here is not the banning, it is the new changed avatar.

I thought to post this here as I believe it may well become an issue on all serious forums the larger and busier the forum gets.