Because it hurt his feelings. Like if someone uses your wrong pronouns, or tells you you are in the wrong toilet, or doesn’t shush their child when the child says “ mummy why is that man wearing a dress”. Because however tall you are however large your Adam’s apple, however visible your beard, however deep your voice, however huge your feet, however crooked and fake your wig, however clumsy your make up or blue your eyeshadow, however apparent your male entitlement, however tight your pink leggings, if you say you are a woman the world has to suspend their disbelief otherwise you might be sad.