And there was a never a gender binary, because gender is a multifarious spectrum that’s different in different places and changes over time. For example you might think that gender involves men not wearing dresses or make-up, but that hasn’t always been true even if limit it to a narrow UK-only view, as there have been times when men wore make-up as the norm, there are exceptions for kilts which are associated with battle and manliness, we know men wear make-up for stage performances and TV, and so on.
Anything you can think of to claim is a masculine-only or feminine-only thing, there will be exceptions, and people who’ve gone against it, not just now but throughout history. if you consider the whole world and all cultures, then there’s hardly anything that is gendered only masculine or feminine. Unsurprisingly because gender is societal, used to control people and varies according the the society.
As I said, I’ve been breaking gender norms my whole life. I’ve opted out of the “gender binary” that you perceive. I did that naturally, like many people do, because it’s who I am. So am I “NB”? Because if I’m not, but in real life am actually just as non-binary as an “NB”-identified person, then how is it a thing? It’s clearly just a made-up label.
and I totally agree we should respect that some people have a “Gender identity” as part of their inner feelings about themselves, just as some people are religious. What’s then not OK is for others to be forced to accept those identities in place of actual sex, and that’s what’s happening.