To be fair it could maybe be counted under unnatural variations.
He is styling it in a way that is not typical for the society he actively participates in.
(second part not necessarily connected to your comment anymore)
But I think it’s stupid to ban hair styles anyway. I often had some classmates with weird hairstyles and guess what, didn’t distract me from school.
In my opinion the dresscodes for school should be:
cover your genitals generously, ass and boobies (regardless of gender. I think there isn’t place for shirtless guys in school outside of the gym). In general that means pants/dress/skirt and a shirt/top, but I wouldn’t care if they wear a toga or whatever.
don’t wear extreme political symbols or other obviously widespread offensive symbols (e.g. a swastika)
unless absolutely required by your religion, or physical reasons like a burnt face, never wear anything that covers your face
And that should be it (this list includes my limitations on hair styles and tattoos as well)