Postmodernism is a political ideology that developed in the late 20th century. It’s characterized by subjectivism and relativism and deconstructs Enlightenment concepts of reason, objectivity and merit. The root idea is that “everything is a social construct.” Thus, it asks, how can one identify and qualify merit.

“We choose truth over facts.” — Joe Biden
The other root idea is that no real effort, insight or knowledge is required to achieve and have value in society. The end goal is leveling and is little different than the Illuminist revolutions described by Nesta Webster.
<...>
Postmodernists don’t truly believe everything is subjective, or “not real” (aka Cartoon or Clown World). After “disproving” existing reality, they choose a very specific new reality. They use subjectivism as a strategy to destabilize established thinking and tear down the pillars of Western establishment so that they may recreate society with their own Illuminist vision.

That vision is a socially-engineered “utopia” of anti-meritocracy, tyranny of the minority, pseudo-science, Orwellian double-think and control over speech and behavior.l
<...>
Since judging and criticism are considered “oppressive” under cargo-cult postmodernism, it can serve as cover and smoke and mirrors for the kakistocracy — or rule by the worst. Kakistocrats thrive in a relativist, subjectivist or “do as thy wilt” system. It’s an environment made to order.

One of the tricks of postmodernism is to define it as a solely leftist phenomenon. Although it’s most definitely based in discordian Illuminist Marxism, it can more accurately be thought of as a strategy for asserting political and economic power than a true belief system.

Thus, we arrive at the age of warring postmodernist cults. Here, the warring cults on the left and faux-right accuse each other of “post-truth” and “fake news.” They set up a fake Hegelian dialectic. At this point, postmodernism seems to be the establishment ideology across the West.