@TerfsUp
I don't want to be rude. But you are simply wrong.
XX / XY denotes chromosomal sex, but some people can have both, some people can have a single X, some people can have XXY.
Then there is the matter of sexual organs and genitalia which do not always follow genetic chromosomes.
Intersex conditions are actually not that uncommon. Something like 1:2000 babies are born with ambiguous genitalia. 1:2500 female infants actually have a single X genotype. Have you ever heard of XX syndrome? Completely phenotypically male babies with XX chromosomes, that's one is 1:20,000. CAH affects 1:10,000. 1:500 to 1:1000 boys has XXY chromosomes.
You are the person trying to alter biological reality to fit your own view of sex and gender. After all, you just told me something is impossible when it plainly isn't and you could read about it if you chose to.
Apart from chromosomes, sexual organs and genitalia there is the matter of legal sex, which regardless of your opinion, is also not dependant upon the chromosomal sex or necessarily the organs or genitalia that a person possesses or used to possess.
Then there is gender and sexual identity. Which may or may not tie in with chromosomes, phenotype, or legality. Some people just find this interesting, not threatening.