Peterson has built his career railing against Postmodernism. First in academia then in culture in general. Sometimes he calls it Postmodernism, sometimes ‘Cultural Marxism’, sometimes ‘Neomarxism’.

Since so few people understand what Postmodernism is I wrote a Medium story about it here: https://jaime-roberts.medium.com/the-hyperreal-world-of-postmodernism-93f1130f55f0