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aside from being cissexist the whole XX = female and XY = male thing is Straight-Up Wrong
AFAB people can have XO, XXX, XXXX and XY chromosomes while AMAB people have have XXYY, XYY, and XX chromosomes and since the majority of the population never has their karyotype examined, they’ll never know that they have one of these chromosomal quirks unless that specific combination has associated symptoms, and not all of them do. you could literally have one of the aforementioned combinations without even knowing it and meanwhile you’re insisting that all AFAB people are XX and that anyone else who has this must also be female
we could also talk about how hormonal patterns for XX persons can naturally and biologically mirror that of a typical XY person, or vis versa, which gives rise to things like androgen insensitivity disorder. here u have it, folks, an whole group of intersex people who have XY chromosomes and testicles and vulva and vagina, all grown naturally, all at the same time.
the number of people who are intersex mirror the number of people who are born with red hair, but no one goes around trying to say that red isn’t a natural hair colour just because the phenotype doesn’t manifest in the majority of the population.
seriously consider the bold if you are aggressively upholding the ridiculously flawed theory that is the sex and gender binary.