ok - in that case: when I switched to a white collar job suddenly all the world's knowledge was unlocked in my brain, and I knew the meaning of all these terms that had heretofore been opaque to me.
Those with the capacity and inclination to learn such things (meaning academic theory and systems) who are born into working class communities or families are heavily encouraged to leave the working class behind and cut ties. The working class communities are intellectually strip mined, and the kids quickly learn their only chance at success relies very much on learning to hide where they came from unless they're trotting it out for sympathy points/scholarships, in which case you need to talk about your background but make clear that you've ~ transcended it. As a result the only people left in the working class as adults are those who couldn't learn academic theory.
Some exceptions I've seen are people like my mother who grew up higher-class but 'defected'. Another exception is occasional disabled members of the working class.
It has nothing to do with the intelligence or ability of the working class as a population and everything to do with the fact that people in that class who have certain abilities and types of intelligence are offered a way out that others aren't. (e.g. A mechanical genius is less likely to get this treatment than a kid reading several grades ahead ).
The author addresses this in the text. He claims the wealthy have the time (And I will add access to resources like the internet and books) to spend on learning esoteric knowledge. From my N=1 experience, that seems to be true. I don't really get why that offends you. Is it really hard to believe that people in different social classes prioritize learning different things?
well probably because I have learned more esoteric knowledge than almost anyone I know despite having come from poorer circumstances than anyone I know, and I learned it while being poor.