The "there's only 2 genders - XX and XY" take is the biological version of saying only whole numbers are real because you learned 2 comes after 1 from Big Bird.
There are a bunch of non-XX/XY folks out there

XXY (Klinefelter Syndrome), XO (Turner Syndrome), XYY, XXX, XXYY, XX male syndrome (where the SRY gene causes male characteristics), XY Swyer syndrome (where the SRY gene causes female characteristics)

She's denying the existence of over 1M Americans!

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