They can fuck right off with their Klinefelters/Intersex/Hermaphrowhatthefuck strawman too, you don't make decisions that effect everone based on a statistically insignificant outlier.
Just jumping in to add and remind everyone that most intersex conditions are specific to biological sex, either, which makes the non-argument even funnier. People seem to think 'intersex' automatically means 'peen and vagoo' futanari or just amorphous genitalia.
Swyer-Syndrome e.g. is a phenotypical female, who has XY-Chromosomes, but the Y-Chromosome doesn't have the SRY-gene (which is ... as I understand something like the switch that make the Y-chromosome 'functional'. Sorry for the laymen's language, smarter, less inbred kiwis feel free to drag me if I'm telling bullshit)
Those women look normal, and have normal looking female genitalia, but often a underdeveloped womb and missing or barely developed ovaries. Which is why it is mostly diagnosed when a teenage girl simply doesn't hit menarche.
True hermaphrodism or ovotesticular syndrome is extremely rare, I think something along the lines of 500 cases in recorded medical history. And even those don't produce both eggs and sperm, or a functioning vulva and dick/balls.
Bottom line is, intersex conditions are more comparable to something like being born with six fingers than anything under the rainbow mafia umbrella. It certainly does not mean that sex is in any way or form a spectrum. When somebody forgets to install central heating in a house, and it gets snowed in and cold in the winter, that doesn't mean that it suddenly is on a spectrum between a house and an igloo, it's just a fucking defective house and you should sue the construction firm.
And if I were intersex, I'd be fuming to be used as an argument by troons who turned their brains into sewage by beating it to futanari hentai. First because troons, obviously, second, because it propagates dumb disinformation and stereotypes. Intersex conditions have some unpleasant comorbidities, after all.
I know most of the stuff has been repeated ad nauseam, but I find it cannot be emphasised enough.
Transsexualism is mental illness at best, a first-world-problem for sure, and degeneracy at worst. I'll climb off my soapbox now.