It would be a mistake to think it was stupidity.
If these are a generation mostly under 30, then they were taught in schools with Progress Pride flags and Stonewall posters, viewed BBC propaganda like 'Butterfly', or the programme that told us there were 100 genders, read that appalling Scientific American article that claimed sex was a spectrum, watched Dr Who, read Mermaids' stories, and heard numerous media stars whang on about the dolls and 'no debate'. 'Glitter families' were promoted and anyone who didn't affirm was shunned and monstered.
They were raised with Juno Dawson telling them being gay was the booby prize, Shon Faye reciting his execrable poetry, and trans people being feted and fetishised, stuck on podiums both real and metaphorical.
Then they made it to the NHS who told them puberty blockers were a harmless pause button and throughly indulged and affirmed their gender-addled dreams. Their families may have been hammered with the story that they'd die if they didnt affirm them.
A whole movement of very determined older people have deliberately created this environment. They have groomed this generation, with the support and validation of every single government body and institution.
That Reddit thread is the logical outcome.