I am a bit confused by this thread to be honest.
FA, as well as any AFAB people certainly had a different experience growing up, and while I would dispute an absolute generalization on any childhood being the same as one another, or having the same hangups; it would be foolish to think that a large swath of the AFABs didn't have commonalities at least in western culture. This undoubtedly has effects on young people who internalize messages delivered to them, and those that seem to escape this sort of programming I will concede do seem like a tiny minority and are exceptions to the rule, and their existence doesn't diminish the struggles of the average AFAB cis or trans.
The confusing part comes in to, why at the start of the thread was there so much talk of Transwomen not understanding femininity, with implications that many were clothes obsessed posers? That was the part that invited a rather defensive response from transwomen, and to be fair that particular part wasn't said by the OP at all....
Though, I am confused exactly what the OP was getting at by saying the part about the "whale" of a woman not being able to wear what she wants, since this social pushback would be similar to all women AFAB or not. Society views a woman's worth by her looks, we all know that and it really doesn't seem like it makes a difference if she was AFAB, which made me a bit confused exactly how it relates to the AFAB experience the OP was talking about. I may well have just misunderstood the point being made (though, to be fair to overweight readers, 'Whale' is probably not the best word choice here).
Regardless, if you look at the remarks made in the start of the thread by thephoenix, and then commented on by others, I think it becomes clear where the thread went off track, because I think the goal was to discuss the negative effects of female programming on men; which has nothing to do with being critical of women liking dresses because "real" women wear pants more often.
So, how about we forget about those comments which naturally put us MTFs on the defensive, and focus on the actual hangups and issues caused by an AFAB upbringing. As I understand it FA isn't trying to say anything to the effect that MAAB transwomen don't understand what it is like to be a woman, merely saying that he and most AFABs have a different experience growing up. Guys seem to have a tough enough time expressing themselves in this regard as is, no need to make them walk on eggshells because of something someone else said.