There are few things more American than the passage you just quoted. It is about a fan of an aging stoner/rapper talking to a Wal-Mart employee about the fact that he wants cereal.

Indeed, but it's an example of the kind of real America that doesn't feature in Hollywood scripts very much.

It would seem too banal to most Americans

This is not a normal human, less then probably .5% of 340 million Americans are like this.

It's called being an attention-whore and hoping to strike it big by filming a non-controversy and making it into one on Tik-Tok. You can thank social media (and regular media) for the profiting off clicks/algorithms/non-controversies and driving this nonsense. This isn't filming a cop making an arrest to keep them accountable, it's filming a store manager hoping to create controversy and rid her of her job because she 'said or did the wrong thing' on film. It's no different then filming a fat/alt-lifestyle/whomever person on the bus without them knowing and then making fun of them to drive clicks to your video.

The guy filming is not the weird part. You don't think the fact Snoop Dogg has a cereal and is suing Walmart for not carrying it is strange?

Perhaps I missed the evolution of Gansta Rap and that's the main lyrical content these days...

I think the evolution happened when Snoop and Martha Stewart started doing shows together.

Yeah TV America is a different thing. Anime and Japan.