There are a lot of studies that support a difference in brain function of people with gender dysphoria. It is also factual that men and women have different brain function. Gender roles, i.e. boys playing with dolls and girls playing in the mud, have to be squashed by parents in the initial stages of life. The idea that you are neither a male or female because you like to do activities that belong to both "gender roles" is ridiculous. Either you have higher amounts of estrogen in your body or testosterone because of the organs you have. I agree that we should break down gender roles, but gender roles and biological gender identity are not the same thing.