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The kids are alright.
(hexbear.net)
Link because I am not always a lib.
Cw: 
https://old.reddit.com/r/Teachers/comments/16fw9br/911_is_hilarious_to_these_kids/
I never lived in USA and it feels weird for me to joke around other country's tragic event.
That being said, (dark) comedy is a common way of facing tragedy and I also can see why many USA citizens are desensitized on this event. For what I can grasp the reaction was so overly exaggerated that people have had enough.
Don't get me wrong: it was a tragedy, but it's silly to expect everyone to feel personally affected to THAT level even after decades (and most without even knowing one of the victims).
I'm pretty sure that even in that year many citizens might have moved on kinda soon and didn't care THAT much, but would keep quiet to avoid drama. At some point the edgy comedians made people realize not caring THAT much was pretty common and even the kids started openly joking about it.
I think there is an additional dissonance considering the US let a million+ and more of its own citizens die from Covid but we still commemorate the victims of 9/11 as the greatest evil done to the country in recent memory. (That's how I also know Americans don't really believe the claims against China being the origin, producer, and disseminator of the pandemic)
As an American, I give you a 9/11 joke pass. I hope to see you in next years 9/11 mega.