The article in the New York Post, appears to be referencing this article by Daniel Cox of the "Survey Center on American Life". [1] The article itself on americansurveycenter website is far more extensive with a much larger discussion. [1] https://www.americansurveycenter.org/research/disconnected-p... Much of the article that is the source is actually devoted to the discussion about working class vs educated divides…
What I notice here (Switzerland) which has a lot of clubs and associations is that less and less people come and less and less volonteer to help manage the club's functions. Notice that the clubs are still there; the opportunity to socialize is present, the club exists, has a place for its activities, a program; yet less and less people take the opportunity.