In short, it is a backlash to alternative reality, alternative facts, alternative science, alternative math. It is a backlash to the self-perpetuating cycles of mutual lying between rightwing media, rightwing politicians, rightwing donors and rightwing voters, each preventing the others from straying one millimeter away from this alternative fantasy world. It is a backlash against anti-empiricism, anti-science, anti-facts, head-in-the-sand, “we make reality now” mindset. Practical solutions require dealing with the world as it is, not the world one imagines to be or wants it to be.
And when postmodernism in public life reaches a point of saturation, and when people have had enough of it, and when there is a backlash, people will go for as extreme opposite as they can find. In this case: math.
Notable here are the association of right-wing ideology with postmodernism and “alternative” worldviews; the boring clichè of postmodernism as detached from reality, or denying reality; and the peculiar implication of math as something closer to reality, presumably due to its affiliation with science, or perhaps by contrast with science.
The association of right-wing ideology with postmodernism is not really new, although it may seem counter-intuitive to anyone who remembers the US conservatism of the 1960s. The trend toward shrill, self-congratulatory “conservatives” has accelerated in the last 12 years, and this egotism has become conflated with subjectivism in the minds of monistic, rationalist liberals.
Another factor feeding the use of this attack against conservatives has been the use of postmodernist arguments by creationists and dominionists. I personally applaud the trend of using postmodernist arguments, but it is regrettable to see them used by people who are ignorant of the implications, especially when their colleagues in the “culture wars” are attacking secular culture as being too postmodernist. Basically, postmodernism is the whipping boy for both kinds of positivism.