"The post-modernists champion ancient errors while pretending to be avant-garde."
Well WT, I agree with your statement to a point. Certianly the aura of avant-garde is very important to the post-modernists, and is most like their greatest motivating force.
However, it's not "ancient errors" that they are championing; the most foolish ancient had ten times the common sense of the most enlightened post-modern. The errors that being celebrated are quite modern, co-inciding with Einstien's theory of relativity, which is their gospel.
What is so interesting about Ayn Rand and her philosophy, is that she comes across as an the anti-philosopher--at least as far as post-modernists are concerned. I think she would find good company amongst most of the ancients, with the possible exception of Plato, who she hated.
Most "ancient" were locked into a mix of fear, brutality, envy avoidance (the most vicious kind of envy), and the superstitious traditions that grew out of their fear, brutality and envy. Post-modernists are the "ancients" of modern times.