I just don’t get any of this. I can somewhat understand boys or men who are somewhat feminine in demeanor wanting to change, but Bruce Jenner and this Seal were very masculine males with lots of testosterone and then they snapped. I am thinking in these cases it could be more mental illness.
That very extremity is most likely what triggered their oppositional response. Reaction-formation is widely known. Also it has ancient antecedents - in the Yin-Yang symbol, the tiny dot of one color forms in the center of the maximum expression of the other. And in more mundane things, after doing anything intensely, what do you want to do? Its opposite. Now granted, changing sex roles is extreme, but do is being a SEAL or winning the Olympic Decathlon.
So... IF (and only if) these desires were latent, they could have been avoided and denied by pursuing a hyper-masculine endeavor, which then bounced back when they achieved it, leaving them nothing left to "justify" about their masculinity. In a sense, they feel its more safe enough for them to express their feminine desires, because they've proven their manhood beyond any doubt (which also tends to make them want to be extreme in their feminine expression, too - these aren't halfway kinds of people).
Ironically, it's the sissy metrosexuals who will try to act masculine to reverse the impression they are wimps. But, being lost in their avoidance of manhood, they act it out like a young teenager, inappropriately, and even cross-sexually.