The title is slightly misleading, and the ban applies towards future CDing in "wacky week" events. Although I wouldn't be surprised in CDing was already banned in general. Still, even a lot of schools lacking an explicit ban on crossdressing still have rules like "no earrings for boys," so it is reasonably fair to say that many schools (or at least school districts and school boards) impose mainstream traditional culture on its students in some form or another, showing contempt and prejudice for those outside their social circle. It's not the school's responsibility to culture the student, but rather have the student gain the understanding to make the right decisions themselves (or as Houlter said, the school should be a place to learn, not condemn).