In general, you should have enough tolerance to host discussions and debates for people you disagree with

You weren't looking for a discussion, you were looking to make a statement. You weren't there to listen, just to preach. If my opinion was "slavery was good, so I don't see why you're complaining about it" I'd be shown the door in plenty of good communities due to the inflammatory nature of my discourse. It would also be clear I'm not there to discuss anything.

I've also shown you it's not an opinion rooted in science as they do classify more sexes, so in the end it's a social opinion you hold, and tbh that's not worth a lot (and definitely not worthy of the discussion you crave).

I therefore believe that the whole idea of non-binary is pushed primarily as a grift by the medical industry to sell “treatments” for gender dysphoria

You know Pakistan & India also recognizes a third gender? The Hijra. I guess the medical community has a long history of this grift all the way into antiquity such as Ancient Egypt (they wrote and described their notion of a third gender) or even somewhat recently the Mughal Empire (15th century). But yes it's totally a grift.

Your lack of knowledge isn't mine to fix though. You've set your opinion to be something malicious because you want it to be, but even a quick glance at a wiki page would tell you the much longer history.

The rest of your comment veers off into randomness mentioning religion and how you talk about human nature as if you're an expert, and I think we've spoken enough already. I'm not going down a long windy irrelevant discussion on the matter.

You're free to have the last word, I will be going further with my day, my best to you.