Two factors about the long reach of skeptical philosophy and its practical results.
Social construction of reality: If influential philosophers teach that “reality” is merely a social construct, then what happens to us in the next, taught generation? We focus primarily on the social — on doing whatever we can to construct social reality according to our wills. We focus on what everyone is thinking and feeling and saying, and “real” reality becomes less significant, even irrelevant, to our psychology. And whenever “reality” is being obstinate — “facts” intrude upon us — that just means we have not been social-constructing hard enough.
Anti-objective epistemology: If influential philosophers teach that “logic” and “objectivity” are myths, then what happens in the next generation? We are not taught to strive for objectivity or pushed to do the hard work of learning math, logic, scientific methods. We never acquire those skills. They become alien to our psychology, and instead (with encouragement) we explore and indulge our subjectivities — sex/gender desires, racial identity feelings, stressed-out-by-money-and-work reactions. And whenever others disagreeably push “data” and “reasoning” in our faces, we resist — viscerally.
Phrased neutrally: After first-generation (1960s-1980s) postmodernism’s anti-realism, social subjectivism, and conflict collectivism, the second generation (1980s-2000s) applied the high philosophical theory to their teaching (and non-teaching) in history, law, journalism, education, and politics. We (2000s-2020s) are the third-generation result.
Phrased uncharitably: Postmodernism created a generation of semi-psychotic, semi-neurotic, ignorant, and hostile whim-worshippers.
Related: The fuller story: