There are two facts that come out of my questions 1) We can say with very high accuracy who is male and who is female just by looking at them. Our "guess" almost always tallies with what they report. 2) Our recognition of sex can result in hard objective end-points to show we are correct: pregnancy
These are facts you will struggle to explain away with your batshit gender ideology.
Neither of those facts has anything to do with the question you are (still) failing to answer.
Why does it matter how we know when it is obvious we can? We pick up myriads of cues about people's sex - any combination of which can be a give away. It is why people with trans identities are rarely successful in fooling people about their sex. It is a hard thing to do.
I think he may have read the study I posted and ran away!
Well, at least two reasons. First, because it’s a claim you made but can’t defend, and more than anything it’s been entertaining watching you chase your tail about it. But more importantly, it matters because it leaves you with no clear basis to say a person is not the sex they claim to be.
You can say it’s basic biology, but you can’t define that biology. You can say 96% of people will validate your intuition, but that other 4% matters. You’re trying to fight for a binary reality. Either there are no exceptions, or not. And “not” is a big deal for you.
What utter nonsense on stilts. The central fact you wish to deny is that humans are a sexually reproducing species with two sexes: male and female. Those sex roles are distinct, objective and observable which is why your mum and dad were not surprised which one of them got pregnant.
We have distinct sex organs for each role. But as moderately dimorphic mammals we do nto have to observe directly those sex organs as we can take in the myriad of clues from our body shapes, gait, voice, hair, facial structure and so on. And rcognise sex in adults in the high 90's%.
The reasons we get a few wrong can be due to several factors: Secondary sex characteristics do overlap - not much, but enough to introduce a percentage point of errors or so. That does not mean such people are not male or female, but atypical in body characteristics.
Younger people who have not matured are less dimorphic and may introduce a little error. Older people may lose some body shape etc. And some people try to disguise their sex with varying degree of effort - including surgery. Another tiny percentage of error.
None of these errors requires us to abandon the sex binary - two reproductive roles based on a gamete type. This is the fact you so much wish to deny so that men who say they are women can transgress into women's spaces.
It means that, even on your own terms, you do not know what a man or a woman “is.” You think 96% is good enough to effectively deprecate millions human beings as equal members of society. Which tells me that safety and dignity aren’t really what your beliefs are grounded in.
What question is he failing to answer?
Fun facts: All people are born of a biological woman from an ovum (large gamete) and a man from a spermatozoid (small gamete). Sex is binary (anomalies occur within the binary system). Genders are countless, limited only by human imagination.