At least according to the three children im around on a regular basis, phone games are also in the category of "cringe things that are boomer-coded"

Kids these days have it bad for games.

Strong agree, cringe culture is cringe

Getting a solid answer on that from teenagers is basically not possible. They live life based on "vibes", and the vibes are cringe

Partly because extreme self consciousness has become normal in the era where abnormalities can get you recorded and posted on the internet for mockery.

Like I get it, I have an anxiety disorder and cptsd and was bullied as a kid all of which combine to a form of extreme self consciousness. But my fear of playing my steam deck in a laundromat or on the bus is what's left of what was at a much less healthy stage of life a fear of going to the grocery store or browsing in a shop for more than exactly what I went in for (ok I still struggle with that one).

It's mental illness that certain corners of the internet, 4chan especially, have not only normalized, but gone so far as to encourage in each other and likely induce. Also given that it's 4chan it probably originates with self consciousness from failure to understand social rules and expectations and the policing of themselves extending to policing of others

Well i know two teenagers that disagree with you

I have taken my kids to some pretty small concerts, that they asked for rides to, that garage band scene is still around it's just not our scene anymore, right? The main difference I found is that my kids wanted to share the music with me, wanted me to go see it with them and my God I would never have done that with my mom.

So thankful they grew up and do wear stupid clothes (and sometimes awesome costumes for conventions). In our family there's a gender split - the boys & men including the trans one are less about going out, the girls & women are all more into going out to shows & events.

Yes they think sincerity is cringe in most circumstances, but i wouldnt agree with any of your other points