StoneByStone
It's OK to Be White
When it comes to brain activity, that's where things get very interesting. I'm familiar with the argument that trans women and trans men exhibit brain activity that is supposedly associated with the gender they identify with. What makes this argument interesting is that it contradicts the idea that gender is socially constructed. For many years, feminists claimed that it is a social construct, but if we are to believe that one can identify someone's gender by brain activity, that clearly means that gender is at least partially biological.
There is a difference between gender and sex. When Feminists say "gender is a social construct," what they mean is that gender roles are a social construct. There is no gene that doesn't allow men to wear dresses. Men don't wear dresses because of social pressure.
Strangely, much of the same left that pushes this argument is often reluctant to notice physiological differences between men and women. Biological males have several advantages over women in most sports, due to higher potentials for strength and speed, and they have denser bone structures as well. This is why allowing biological males to compete against biological females isn't fair -- particularly when looking at things like MMA.
And that's why most of the Left disagrees with allowing trans men to compete against women in sports where strength matters. But mainstream companies have fallen for the Alt-Right narrative that SJWs are common.