I know I say this every time but Imane Khelif. People were insisting that she was a man, and that even if she has woman's reproductive parts she was still a man. They were saying what was inside her didn't matter. Those transphobes could watch her give birth and would likely still insist she was a man.
They can talk about "Only human females can give birth" but have no problem insisting a biological female is actually a man when they need someone to hate.
It suddenly wasn't binary and suddenly simply having more testosterone was all that was needed to "be a man"