I didn't talk down. Genuinely, high school biology teaches us that there are two sexes XX it's a woman, XY it's a man. That's literally what we learn.

It's only after you dive into the science at a collegiate level or higher that you learn there's a small percentage, maybe 1-2% of people, for whom this binary understanding is not a good model.

I'm not saying it's bad to only have a high school understanding, just that it's an incomplete understanding.

You may not have intended to talk down. But it came across that way...

Apologies! Text is difficult. If I did a poor job, I'm open to suggestions on how I could have rephrased (and if I can still edit the post, I'll try to do so).

It wasn't so much the words - the words were fine. It's the assumption that "I know real biology, and you must not".

That's fair, but if you tell me there's a simple biological definition of sex, odds are pretty good you have a relatively simple model.