I can’t believe that the head is actually a woman. It beggars belief that a) a woman and b) a teacher would make this mistake.
I doubt the same mistake would have been made if the head were a man, as it would (hopefully) have been absolutely clear to him that girls' sex-based rights are his to give away.
It tends to be more privileged people of the same protected class not seeing the issues, giving away our rights and condemning others for not being as 'understanding' and 'empathetic' as they are - they wouldn't have an issue so it's inconceivable to them that anyone else would either.