Get ready to be infuriated, his hypothesis is that the big divide in America is along musical lines, country music is emotional, personal and intimate, but can only be this way because it’s audience is homogenous, whereas rock music is more diverse, and because of this diversity there is less shared experience so songs have to have broader appeal, hence why rock music is superficial and all about having a good time, like that upbeat party banger smells like teen spirit, I think he is also super dismissive of the beach boys as well (fair enough they have a lot of upbeat music but he talks about them like they are disposable formulaic pop music, I think, might be misremembering with something else).
It is a truly bizarre episode