This type of crap leads to people becoming apologists for behavior issues that sometimes plaque black students- such as cursing at teachers; constantly disrupting instruction; fighting; bringing guns, knives, and other weapons to school (even here at the Primary school where I teach, grades 2-3). For example, a black principal refusing to punish black students who called a white teacher a "stupid bitch-ho" because that type of behavior was "cultural". The principal told my friend she would have to get over it, it was a cultural thing. No amount of training for teachers or administrators is going to change student behavior. Not punishing students for their misbehavior does not help either. Us teachers cannot undo what is done at home.
She should get the principal's response in writing and take his negligent behavior to the school board. I suppose negligence is "cultural" too.