Well, since you brought it up, postmodernist are also communist so they are wrong againI've seen more complaining about postmodernism than actual refutation, and that's problematic. As a matter of logic, it is a form of equivocation to say "Postmodernism is wrong, idea x is postmodernist, therefore idea x is wrong" unless you can clearly define the term. Otherwise that type of argument is the same as a hard-line libertarian who criticizes everything they dislike as communism. Such a person is reasoning fallaciously because in the first part of the syllogism "communism is wrong" in order for it to be generally accepted to serve as the basis of an argument, communism would have to be defined fairly narrowly as meaning something like the soviet union or communist china, but when they use communism to criticize everything they don't like, they are defining the term in the broadest possible way to mean public ownership of anything or so on.
As for what postmodernism means:
- denial of logic positivism (only hardcore ones claim to believe in this)
- claiming only the internal world exists and not the external world (therefore, they can also be named solipsist)
Or, to be more explicit, claiming only the perception and linguistical designation/label applied to an object exists and not the object itself. Therefore claiming everything comes from the perception aggregate. Claiming the form aggregate is created by the perception aggregate. In short, it's solipsism + the Ajnana philosophy on top of it. For more: https://dhammawheel.com/viewtopic.php?f=13&t=29724
The denial of logic positivism is easily refuted by showing it's self-refuting. As for solipsism, it takes more than a meme to refute, it takes a topic: https://dhammawheel.com/viewtopic.php?f=12&t=29844
The problem is, they never bring any arguments to sustain their position. They just say "it is like this because I say so". If you feel that there are arguments to make for that position, please bring them to that topic cause so far it's lacking any pro-solipsism arguments.