There are a lot of people who are very invested for some reason in gender essentialism, or the idea that there are fundamentally male and female qualities that go beyond reproductive biology. And there are some differences, but
they're not nearly as expressed or as consistent as the essentialists claim.
But ultimately, the most compelling argument against gender essentialism is the essentialists themselves. If there were innate gender differences the way they claim, that'd be that. They wouldn't need to be told a child's sex to know its gender, and they wouldn't need to police it constantly the way they do.