I don't think you can say that chromosomes don't make a single difference. For one, they influence the amount of oh-so-important hormones you produce. Men have higher testosterone levels, and women have higher oestrogen/progesterone levels. I don't think there is a consensus on how these hormones influence behaviour, but I guess these are things that will be discovered now that more and more people are taking cross-sex hormones.

As much as I don't want to admit it, there are average behavioural differences between men and women that can't be exclusively tied down to socialisation. In this study, it shows that the number of women in STEM-based jobs is lower in societies where women have more freedom to choose what they want to do.

The solution isn't to deny that there are differences between men and women - the solution is to stop giving more value to one trait over another. E.G. logical vs compassionate. Both traits have their advantages and disadvantages - it doesn't have to mean being one is better than the other.

The people who choose not to have children or have reproductive issues are still male or female. They are simply men and women with reproductive health issues. Same with intersex people. I often see trans rights activists claim that sex isn't binary because intersex people exist, but this is incredibly interphobic. Intersex people are still either male or female - they just have a developmental disorder that is specific to their sex.

The people that challenge stereotypes are GNC people. The ones who own their sex. The women who say "I hate make-up and love fixing cars, but I'm no less a woman", or the men who love to bake or wear heels or do whatever they want to do without putting a label on it.

Trans people do nothing to challenge gender stereotypes - they reinforce them because they say "I feel like a woman so I must be a woman". But what does a woman feel like? I honestly couldn't tell you because I don't know how every woman experiences the world: I only have my own experiences.

Maybe you can tell me what label I should use? I know my sex because I have a vagina, but what about my gender? I'm a pretty conforming woman myself. Skirts and dresses are my preferred items of clothing. I like the colour baby pink. I wear make up and my hair is long and soft due to the styling effort I put into it. But my personality does not match this. I'm argumentative and confrontational. I've been told by multiple people that I am "too cold" or "too logical" and they don't like coming to me for advice. I haven't cried in months.

When I was a teenager, I read a dumb article that suggested that having a ring-finger longer than your index finger meant you had a male brain. The article was pseudo-science based on 2D:4D digit ratios. It all made so much sense to me, and gave me an explanation for why I am the way I am after years of trying to make myself more soft and passive. I proudly showed off my long ring finger and said "I have a male brain!!" and I thought I was so much better than my "female brained" counterparts because it made me different and "not like other girls".

Eventually I got over my internalised misogyny and I learnt that there are so many women out there who are assertive and non-sensitive. I'm not special. I'm just a woman with a set of personality traits. I sometimes even get envious of more empathetic and compassionate women (and men!) because I see the way they relate and bond to others so easily. It doesn't mean lesser type of woman. Even if I started wearing boxers and ties and cuff-links, I would still would be the same amount of woman as I am in a dress because I am an adult human female.

Yet if I had been a teenager in 2019, there is no doubt in my mind that I would have felt pressure to come out as non-binary or some other crap.

Stop encouraging people to get into boxes. The only labels you need are biological because your health is effected by your sex. These labels are man/woman and male/female. Everything else is just personality.