During the Bush era, my debate coach in HS made the interesting point that neocon conservatives were more 'post-modern' (a tortured term 20 years later) relative to old-school 'truth-seeking', anti-imperialist Leftists like Chomsky
To me, it has helped to see postmodernism more as a literary term, rather than an epoch.
Postmodernists looked at the modernist hellscape and understood it completely: its mechanisms, its origins, its technology, its social dimensions. Then, rather than to draw the correct lessons, they threw up their hands in defeat and capitulated.
In the 2020s, we are still in the same modernist dystopia from the 70s, the wagon kept rolling down the exact same mountain as it has since then.
Vonnegut, Pynchon, Wallace etc. are what one should think about when they’re discussing postmodernism. People relating it back to gender or race theory is kinda silly IMO.