A woman is a person that adheres to gender roles assigned to them by society. These gender roles are typically attributed but not limited to the female sex.
No one decides what gender they are. That's like the entire thing with trans people. You think a trans person getting death threats wouldn't love to be able to identify as their AGAB?
And even biological sex is a bimodal spectrum. People always ignore the existence of intersex people, but I believe it occurs at a higher number per 100k people than trans. I could be misremembering.