The goal of all modernism is to destroy European culture by redefining it as something nonsensical. Well, they intend that for everyone, but they especially hate European culture. There is actually no such thing as "post" modernism. That was just a term invented in the 60s to make it look like their was some actual development to modernism, instead of stagnation. What most people alive today do not realize, is that this "modern art" stuff is over a century old, and is basically the same as it ever was.
These profiteering middle-men showed up in the late 1800s and early 1900s and sought to replace local traditions with mass-produced goods and free trade.
Nationalism, the existence of different peoples and cultures with their own identities, and objective quality differences between and within them is bad for international business because nations will be self-reliant and attached to their own output instead of yours. High quality standards mean that the thing takes time to learn to even make in the first place.
"Modern" anything is easy to make a lot of quickly, and does not appear to have been made by any people in particular. The fact that everywhere has its own unique, local, home-cooked cuisine is bad for McDonald's; the fact that Iran, Germany and Norway all have their own traditional clothing made by locals and passed down through the family means it's difficult for Adidas and Nike to make sales...unless they can tear out those peoples' roots.
This permeates every aspect of society now, to the point that major cities in the world are no longer easily-distinguishable from each other.
Ideally, they want people to be indistinguishable from each other entirely, so that no one will have any loyalty to anything — because there's nothing unique among them — but consumer products.
The modernists have made it so that "fascism", "sexism", "racism", and the other -isms and -ists are understood to be the worst labels that can possibly be applied to anyone (even though our ancestors never seemed to cross-examine themselves in this fashion) and so they can use it to browbeat anyone who expresses and interest in upholding the high-standards and uniqueness of our past cultures so as to dissuade people from rejecting their modernist, mass-produced junk.
You will notice that most "Individuality" today is totally determined by loyalty to certain brands. Do you ever notice how all of these hardcore YouTube "individualists" rooms they film in are adorned with action figures, movie posters, video games, plastic figurines and they're always wearing a t-shirt emblazoned with some corporate logo? Perhaps a metal band logo or Captain America shield?
The weakest people of society eat all this stuff up because it is sold to them as "equality"; which doesn't exist in nature. If we accept the obvious truth that Bryullov really was a better painter than Kandinsky, it means that our work may be judged to be inferior to someone else's too. It takes a lot of effort to be good at something, and not everyone has it in them to BE good at a particular thing. So, when you offer to lower standards/the playing field, when you say that some paint thrown at a canvas is "just as good" as Bryullov, or some random notes on a keyboard is just as good as Mozart because of "it's all subjective" solipsism — the least-skilled people in society will eat that up because it offers them a chance to play too in a field they otherwise couldn't compete in.
But as we see, the result is ugliness, sameness, and cultural decline.