Probably has nothing to do with Bonner, it simply has to do with the school's dress code.
At this point, if people don't like the rule, they need to go to the school board meetings when they vote on the dress code policies for next year and make their thoughts known. Right now, if it is a part of that district's dress code, getting mad at the school, the principal, or whoever is pretty stupid....they are simply following the district's policy.
I think there are a lot of rules, ESPECIALLY, within school dress codes that are stupid, and I make sure that I am a part of the decision making team so that I can make my thoughts known.
It is funny that people have all kinds of opinions (mostly speaking about parents here)...when it comes to school dress codes, curriculum, etc...but you ask them to be on a committee that makes these decisions for the district that their child is in, and they run for the hills.
Stupid policy, IMO....YES, it is not a distraction in the classroom once the teacher says....oh look who is shaved on your head, ok guys back to work. BUT, at this moment it looks to be a part of the school's dress code, therefore you follow it or you don't and suffer the consequences until it is changed.