YANBU!
This is a pet hate of mine and I am pro school uniform (to a point).
I think a uniform should be practical and cheap. I cannot bear state schools who insist on stupid sub rules for dress and hair style.
I would prefer all kids to have the sweatshirt, polo shirt, jogger type uniform as its cheap and easy to care for.
Schools that confiscate coats because they are not of the right type, state what colour socks children have to wear and ban hair styles are being bloody precious.
Your hair is part of your body, its your property and its not up to somebody else to tell you what to do with it because they think its unsuitable or (lets face the real issue here ) common.
Making children follow rules for rules sake does not encourage discipline it encourages rebellion and resentment.
My boys are mixed race and they have dreadlocs because they are practical and I think they are beautiful. Not that long ago it would have been ok for a school to order them chopped off because of ignorance and cultural bias. They cant do it now although I have had the odd comment off teachers. One thought they were the cause of my DS's severe eczema .
If there were to be rules about hair I would prefer that parents of little girls were told to tie their children's hair up so they didnt keep passing bloody head lice on to those of us who bother keeping hair out of the way and checking it regularly!
That has a practical and health reason. Banning a bit of self expression is just someone trying to say that their idea of what looks ok is better than someone elses.
PAH