This remind me of something. In music criticism there are two terms, Rockism and Popism.
I feel like the intial drive against "Rockism" was to embrace different subcultures, like punk and post-punk, but later the result was "Popism", which became its own kind of orthodoxy, pushing critics into treating label-engineered chart pop as deep just because it’s popular or polished.
Back when I was a journalism student wanting to work in music in the early 2000s I used to frequent early internet hangouts for critics and it was interesting to see the change happening progressively, with critics increasively and progressively adopting a certain air of superiority over anyone who couldn't conflate popularity with genius.
For me the big chasm was over brazilian funk music. Sure I could see it a few times as somewhat interesting, and I could understand the appeal as dance music, but the old guard was trying to use old arguments to push it as "descendants of Kraftwerk" while the new guard was using socio-anthropological arguments to defend it. The music rarely stood for itself, and when it did was often on the back of previous music. I'm not saying it's automatically "bad" but its positive qualities were blown out of proportion by critics for me that it become grating.
Today the internet made it all even worse, lots of "pop culture centric" communities are 5% about music and 95% about the personal life of artists, the TMZ-level gossip, the memes, the constant fighting virtual wars with other pop-music fandoms, the metacircular discussion around the fandom itself...
Maybe anti-intellectualism, novels that nobody wants to read, and a move to STEM might be three symptoms of the same root cause: the cutting edge of the humanities moving so far away from popular taste that academics are no longer legible to ordinary people.
I think these are factors to the extent that one sort of needs formal training and schooling in the historical development of the form to appreciate experimental and more contemporary work. The same can generally be said about visual art.
Because of that, yeah, hyper-specialization in schooling and a general movement toward stem means that a lot of people don't actually acquire the requisite background to engage with and appreciate modern work in a sufficient way—just like someone untrained in computing probably would not have an easy time understanding or appreciating significant breakthroughs in computer science.
The rising tide of anti-intellectualism.
The decline of humanities education in favor of stem education. This has both economic drivers and national security drivers.