Expose the self-serving. People often prefer theories, interpretations, and facts, merely because they are self-serving. It is always a good idea to point out when the views people hold are clearly in their self interest. However, just because an idea is useful to the person advocating the idea, doesn't mean that the idea is wrong. Postmodernism embraces absolute relativism with remarkably little regard for the philosophical consequences.
Postmodernism confuses reason with belief.
Postmodernism adopts a moral tone which is contrary to its own premises. Postmodernism over-emphasizes the fallability of observation. Postmodernism wrongly assumes that language is unconnected with the real world. Postmodernism criticizes forms of science that were long ago abandoned. Relativism Relativism is the belief that all ideas are equally valid.