@carol888 : Per district policy, all main policies such as dress code and peer treatment have to be the at least similar in manner with each corresponding school to that district, along with a school going to their corresponding district with anything they want changed.
Meaning that this kid had had his hair the exact same way since being 10 years old in this exact school district, and it's just now become an issue for staff at his high school. Clearly this rule was added halfway through the year in a very unprofessional manner as there was no warning, no preparation during breaks when students would not be in school, no meeting over it.