First thought : it's sad that you have to prove you're a card carrying good guy in preface, but that speaks to his whole point.
We spoke a lot about the whole "economic anxiety" stuff in the US politics thread.
Otherwise I think he's right that there's two bubbles. Which in itself isn't new, but the problem now seems to be they don't overlap or communicate at all anymore. I suspect the radical and quick transformation of our societies towards urbanization (including mechanization in agriculture and longer supply routes for basic commodities) may play a role in this. This may be especially compounded in the USA because the "flyover country" is, well, so vast. Globalization also means that the real important stuff is being decided that much far away.
Someone mentioned an anecdote in the last 538 podcast that a conservative women told her, in essence, that she didn't understood why all that she was taught was wrong as a kid in her household and community (divorce, homosexuality, premarital sex...) was now right. Is that bigotry ? Most certainly, but it speaks of a genuine feeling : those people do not understand us, and we do not understand them. How do we heal the divide ? I have no fucking clue. I can understand the viewpoint of some liberals that reaching to people like that is not feasible if it means stalling social progress and that they will have to sink or swim... But that's not exactly an engrossing political proposition either because I'm alarmed that letting that divide fester will only lead to violent friction, possibly massive.
I think the political institutions in the leading Western liberal democracies are getting outpaced if not becoming outright obsolete, we probably need to rethink some of that stuff because we need more spaces where people can actually have a discussion, we need to have citizens more engaged, we need better turn over in political institutions to have fresh blood (though career politicians and technocrats are a necessary evil).