I say this with sincerity: I have met precisely zero young people who I think come anywhere close to this description over the last decade.
I’ve seen it in the online world, yes, but this tends to amplify the very very small minority who (on the surface) appear to fit your description. And I see it across all age ranges and political persuasions.
Sure - but I'd argue that's due to the overall unhealthy aspects of internet use and not specifically 'cancel culture'.
The internet has become a constant stream of something that is simultaneously designed to maintain your attention and engagement ( control you ), and sell you stuff ( control you ).