It’s completely illegal per Bostock too. If it’s sex discrimination to fire a man for having a husband but not for a woman for having a husband, it’s sure as hell discrimination to tell a man that he can’t wear his hair a way a woman can.
I think this has been established for school sports even – if the school doesn’t offer a gender equivalent team, someone of the opposite gender must be allowed to apply for the only team. It basically makes teams unisex unless there’s distinct teams.
This school district must be the absolute dregs of Texas for even the legislature and Abbott to say “okay you guys need to stop doing this”.