> My point, perhaps poorly delivered, was that not every person has a “biological pronoun”. How do you even define it?
My understanding is that historically the presence of the Y chromosome was considered determinative. One was male (therefore "he") if the karotype was 46,XY or 47,XXY or 48,XXXY, etc. Indeed, in discussions of the more common abnormal karotypes (e.g., Klinefelter), most of the literature I've seen uses the word "male."
> Addressing these folks by their “biological sex” (of you mean chromosomes) would be hugely insulting, besides the fact it’s not like we got our chromosomes written on our forehead.
With respect to chromosomes and forehead, that's not exactly true. There's sufficient divergence between male and female skulls that some gender expression surgeries target them.[1] I do understand what you mean, and I'm not trying to be snarky. Sexual differentiation is more than just genitalia, and we're well adapted to noticing those differences.
It seems like you're making two points:
1. Those with abnormal karotypes can have an experience similar to the normally karotyped: their self-perception and their anatomy might not line up, and they may prefer to be called by a pronoun that doesn't correspond with karotype or anatomy.
2. The experience of those with abnormal karotypes can and should be generalized to those with normal karotypes.
(I'm a bit fuzzy on (2) but I think I'm representing you correctly on (1). By all means correct me if I'm wrong.)
I could pretty easily see someone relatively conservative on the issue of pronouns (for, e.g., medical or religious reasons) agreeing that those with abnormal karotypes should be allowed pronoun preference but disagreeing with the second because chromosomal abnormalities are the exception that proves the rule.
I'm not sure how it helps resolve the initial question because it requires generalizing from a small set to a substantially larger one. It also offers a more clear reason why one's subjective experience doesn't quite line up with one's body (i.e., a clear abnormality on the chromosomes).
[1]: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7994012/