Student goes to court because of 'long hair'

this high school student has been sent to court for practically no reason at all the principle said that his hair was too long, to me or any other student or person who is logical and normal would think that is just the stupidest thing thy would have ever heard, his hair isn't even that long either he just has an afro, his principle also said that "we cannot allow this because other students will think this would be cool and do it themselves" also one of the most stupidest things I have ever heard, what student will think an afro is cool not many but this student has a right to have that hairstyle, so his school should probably change this rule, as well as all schools should change it New Zealand is the freest country in the entire world, to let long hair against the law or just the school rules is just plain stupid.