Is that really school policy?

Sometimes school policy just confuses me.  For instance, I just received an e-mail from one of Ben's teachers at the middle school.  It said it was school policy that a teacher could not be  used as a limerick and that Ben would need to change his assignment.  Huh, do you think that is a real policy or do you think that the following poem was just offensive?

"There once was a teacher named Zogg,
He decided to eat a hog.
But his choice was not smart,
since he made a big fart.
The room’s odorous smell prolonged."