So you're saying that a vegetarian who lives in an RV and refuses to drive a foreign car is nothing more than a vegetarian who lives in an RV and refuses to drive a foreign car? That's their whole identity? Those are the most important aspects of their personality?
Actually, you bring out a good point. Crossdressing is no more fundamental than any other part of a personality. I like chicken wings, root beer, videogames, dogs, computers, horror novels, some fantasy books, Star Trek, Star Wars, Indiana Jones, rock music, and anything that makes me laugh. Each of these is a part of who I am, and like these, crossdressing is a part of me. But it is not all of me, or the most important part of me.
So even if you feel strongly about the food you eat, house you live in, or car you drive, it does not (or maybe I should say should not) comprise your entire identity, and neither does (or should) crossdressing.
To Shannen: Yes, I've been around children. And I'm not sure what age you're talking about here, but children are sponges when they come into the world, and from the moment the doctor says "It's a boy" or "It's a girl" the parents start treating that child as a boy or a girl. As it grows up, it will learn its gender norms and will come to believe that they are natural, even though they have really just been taught from an early age, just as their parents will believe they are natural even though they are learned, just as their parents will believe they are natural even though they are learned. And so on, and so on.