Remember that anytime you see a news story regarding a school incident, you are only getting one side of the story. Schools are not allowed to make any comments at all about students, so it is really hard to pass a judgment, not knowing both sides.
I, myself, just hate seeing anything on the news like this because parents can basically say whatever they want to (without proof) while the district must remain silent.
Don't know the details on this case.....but....
As a teacher, I dealt many times with parents who were given the clearly stated rules, but didn't want their child to follow for what they considered very good reasons.
But when we make exceptions, it opens a whole can of worms.