There is social class in the US, but that book Class by Fussell basically struck me as astrology. He makes a huge number of testable predictions and doesn't bother to test a single one. I'm not sure why people put so much stock in it.

I think it’s important to read the book more as humor than as science.

He’s not trying to defend his hypothesis at a PhD thesis defense in front of a panel.

It’s more like he’s on the stage at a small TEDx talk. He’s not trying to offer proof for each statement, he’s trying to almost play stand up comedian keeping the crowd engaged.