Easy answer: social media.
Long answer: popular rap music.
Rap has been one of the most popular music genres for a few decades now, and 99% of popular Rap are lyrics like:
" I got this I got that, I do this I do that, I fuck this I fuck that, I buy this I buy that, I go here I go there, y'all are bitches I'm the truth, I'm a God all I do is stack stacks, ect."
The music itself isn't the problem, the problem are the listeners who then go out in life acting like they're a gangster, murderous, drug dealing mobster who everyone needs to fear and respect OR ELSE. It's insaaaaaaaaaanely narcissistic music that gets people into their own ego and greed, and then they go out in life trying to "hustle," i.e.: rip people off, lie cheat and steal to get what you want, give respect to no one but demand respect from everyone, just being a dogshit human being.
There's plenty of great Rap that has a message, but that's not popular. People want to have the greed and the cars and the chains to flaunt on social media and brag, they want everyone else to know they're "winning" at life and everyone else sucks. It brings out the worst qualities of people.
McDonalds worker: I'M THE SHIT Y'ALL BETTER PUT SOME RESPECT ON MY NAME
Janitor: STEP TO ME YOU GET THE HEATER, I'M THE DON
Doctor: BITCH I'LL SPLIT YOUR WIG Y'ALL DON'T KNOW WHO THE FUCK I AM
Regular, random ass people, listening to music and then acting like they're this other worldly deity.