It's all to do with disclipline, me old china, you go to that school, they have rules, you have to obey them. Otherwise tell your parents to send you to a state school, and save their money for a telescope for you.
Long hair gets into your eyes, contains bugs, looks scruffy, makes your hat not fit any more. Do the right thing, look smart. As long as you dont go the other way and have it all cut off. Young bald men look awful - are they all on chemo??