Once you're on school property your First Ammendment rights go straight down the toilet , their rules are backed up by the full authority of the state and they will almost always win . Since you had enough respect to cover them up before entering school grounds I really don't see what the problem is , but apparently they don't agree . I'd tell them that since I covered them they are no longer visible , and therefore no longer offensive . If they pushed it any farther I'd seriously reconsider vo-tech as a curriculum choice . There are other classes you could ake , and the vo-tech school would lose money if you left .