You cam read more about this, and very accessibly, in Naomi Klein's Doppelganger. The shape of "the upside-down" world of "alternative facts" and "post-truth" advocates goes a long way toward explaining why people on opposite sides of this divide have literally different realities.

I also recommend The Age of American Unreason by Susan Jacoby. Though dated, it was published in 2007, its merits outweigh its quaint picture of the scale of corruption, ignorance, and deception we now experience.