Hey no, I think you misunderstood me. I tried to say that it's purely body image, something inborn which is therefore hard to explain. So we misunderstand and think that they are just having some traits that are stereotypically connected with the opposite gender and making a big deal about it, when really if they choose to act stereotypically (not all do of course), it is because that way they feel more socially recognized as the gender they want to be/believe they are.
That was my example about the future society that is completely different than ours, and saying they would still probably try to emulate the stereotypes of that time, not because those traits are anything inherent but because it would help the society to perceive them as what they want to be.