Sorry to UK guy about the previous posts.
I am with you obv!
USA is giving the right runaround. Deflect, claim views not stated, switch around topics like mad to confuse, write in a way that is a teacher to a student, a parent to a child. In the position of an expert to a moderately talented amateur.
UK guy dunno if you're reading this. If it were me (and thank God it's not!) I would approach as learnt through years of internet exchanges on this topic.
Don't use anecdotes
Any data etc will be discarded with some waffle
Children situation still fairly new, different different countries etc. Any UK specific will not be familiar and he'll dig out something from somewhere else refuting.
Or try to bore you into submission in response.
If not anecdote, data then what?
The bleeding fucking obvious is what.
Repeat back most obvious bollocks.
I understand that while you see asking for definition of woman a divisive bad faith question.
You have given X definitions (quote his words). I understand you define words woman man boy girl as purely social roles that are performed according to which one/ or combination of, a person feels they are inside. Is that correct?
You said woman = female or anyone.
You also early on said ... Sex not easy at all no one knows what sex they are.
Given your views, and that what follows is either that the very idea that humans come (at a global population level) in two basic groups, as other mammals do. Ie the ones that impregnate and the ones who get impregnated. Is an error spanning human history globally. And so this entire concept should be discarded, and anything which references or relates to this binary categorisation be reworked accordingly.
Or that you have other words/phrases in mind to reference the approx 4 billion on earth who assumed to be in impregnator group based on visual assumption at birth? Even given you state that no one can know if for instance anyone is actually male, due to the complexities, overlaps and current lack of general scientific consensus around sexing humans.
And keep at him.
Don't be diverted. Ignore prods hoping to derail. He KNOWS that humans come in two sexes. And that they're vvv different in loads of ways so blindingly obvious that all humans know what's what and always have.
LOGIC him. Challenge his flimflam. Take aim on the fact that he doesn't believe any of this for a second. Because actually. As good as no one does.