More at https://www.philosophytalk.org/shows/postmodernism-really-blame.

Postmodernism is often characterized by its rejection of concepts championed by the Enlightenment, like meaning, truth, reason, and knowledge. Some philosophers blame postmodernism for making cynicism about truth and facts now respectable in political debate. So is postmodernism responsible for “fake news” and “alternative facts”? Or does it simply provide the tools to describe popular distrust of traditional authorities, like science and the media? Must we reject postmodernism in order to rescue truth? Josh and Ken find truth in Thomas de Zengotita, author of "Postmodern Theory and Progressive Politics: Toward a New Humanism."