I think it actually has become normal, the idea you are in the wrong body. And has been for a while, just not in this overt way, and not quite as overtly about gender.
Humans have become more and more dissociated from their bodies, with obviously not good results. I don't feel I was born in the wrong body, but to tbh, I've felt since very young that I shouldn't have been born in ANY body, like my soul is imprisoned, trapped into a body. It's kinda similar, but to an extreme level.
Honestly if there was a surgery to have NO body and just be your mind and soul floating around like a ghost or something, I'd be very tempted. So the people who feel they are in the wrong body, well that's a little more doable to "fix"/change.
I still think the mass majority of humans are having severe psychological breakdown, as a species.
This is our own fault, as humans. Humanity did this to itself. And when anyone anywhere tries to stand up to physical or psychological abuse, most humans are silenced. Well, we might be in a result of not dealing with real issues and not supporting and protecting each other. I bet most people have been shamed for having a body ailment or a mental health ailment, even from "professionals."
It's basically not safe to live in a body anymore. More and more are seeing that. However, bar changing identities and possible surgeries, we can't do shit. Well, we could: make it safe to be who you are, support people. Not shame their mental or physical sufferings. Since that's never happened for humans, the only option is to flee...your body. I wonder if TW and TM who have had surgery feel less dissociated from their bodies once they match?
Humans like things to be congruent so that's probably part of it.
I think too many people don't fit into society (cuz societies suck, for mostly everyone) and this has become a coping strategy. And tbh I think the focus on gender with all this is a result of so many people having been sexually abused or harassed, including generational trauma, made worse by the way societies train and treat girls and boys. Literally, humans can't take it anymore. However, like everything in "modern" mental/medical healthcare, let's focus on the symptom instead, or give a band aid, whilst shaming the patient. The humans are gonna self-implode at this rate. Extinction won't be the environment or bombs, it'll be implosion, imo, a dying off with a whimper. Hopefully things can change.
Also, the modern mindset of just shut up and take 12 pills for everything has done harm. Everything has been medicalized...now even gender. It's possible there are some drug companies behind the shadows with a profit and power motive behind all this. The whole antidepressant thing for example...yeah, that worked out well for humans, NOT. People take pills for all kinds of psych issues and humans are even more messed up. Same physically. I mean the usa, for example, is ranked below 10 for health for developed nations and it spends the most on "health"care. Health care has morphed into a business-profit-model like everything nowadays. Possibly some very vulnerable people are being bullied into being slaves to big Pharma or related industries, imo. And anyone who questions it is deemed, bigoted, intolerant, not following the science, "just trust your dr" We've seen this before (well, some have noticed).
Some people somewhere picked up the social fact that LOTS of people, kids and adults, are traumatized by the way society is towards bodies in general and the male sex and female sex, and identity issues of any variety. Someone somewhere is making loads of money off this, plus getting lots of power. The end game I wouldn't know.