"you're a man"
ad hominem

"you were born a boy"
sunk cost fallacy

"you were assigned male at birth"
false dichotomy

"you have xy chromosomes"
false equivalence

"you're mentally ill"
non sequitur

"you're invading women's spaces"
category error

"you'll never be a real woman"
no true scotsman

"you're normalizing a fetish"
strawman

"you can't change your sex"
skill issue