Well, I consider myself a left-winger, yet I've always considered postmodernism largely nonsense, aside from the rather obvious fact that yes, our perceptions tend to be subjective. That doesn't preclude the existence of “facts,” nor does it deny the desirability of setting up ideals and standards that can move us forward to achieve improvements in the human condition. Saying that the Enlightenment was a failure is to say that we have made no progress whatsoever or to simply deny, yes I will say it, the facts. In fact everything valuable that progressive, liberal people believe in has its ultimate source in the Enlightenment, one way or the other. Was it perfect? Of course not. Some of its ideals were twisted into dark forms. And later movements such as Romanticism had to reassert the irrational aspect of the human mind that fuels creativity. Unfortunately the irrationality of Trump and his advisors is hardly creative, and their “postmodernism” is mere ignorance.