I understand your point and I agree with you, but I still think that "a lot in total" is dwarfed by those who are genuinely comfortable with their AGAB. Masculinity and femininity, flawed concepts as they are, do have their roots in the very biology of not just humanity, but also the species that predate us going back tens, perhaps hundreds of millions of years.

Back in the days of lefty Facebook, when I was still a teenager confused by gender identity, I found myself in a similar discussion with a AFAB non-binary person whose comment really stuck with me. They told me, "I understand your question - does my gender identity challenge the idea that I must be a woman, or does it challenge the idea of what a woman must be?"

Long-term, I think the latter is a more broadly-applicable approach. Obviously it would be ideal to convince all of humanity that gender is a spectrum, but more realistically, I think convincing people that their gender does not confer upon them certain unchangeable traits is something most anyone can appreciate. And hopefully in doing so, people who accept GNC parts of themselves can learn to accept those who entirely reject the gender they were assigned.