Did you know that a lot of ex-jahovas witnesses will go over the top to celebrate holidays? Most of them will even have one holiday they will pick as a favorite, and just go ALL OUT on that holiday. Holidays are considered a sin in JW society, and celebrating one is a good way to get shunned.

The same applies to trans people. If you've spent your whole life identifying with a certain thing, but been denied that thing because of some arbitrary reason, you'll almost reflexively 'overindulge' when you're able to finally just enjoy what you like.

It's a bit of a chicken and egg situation. If society just never cared, and let boys enjoy 'girly' things and vice versa, the situation would almost certainly be completely different. For one, they may never develop any kind of dysmorphia to begin with, but even if they do, they haven't been denied the things they want, so there's not the overcorrecting we sometimes see now.