"Triggered" might be about right, because it's something I've seen over and over in much stronger terms than you're using here, and it's something I feel strongly about. That, and John Eden's post about a public talk on "left/right convergence", and the appeal of conspiracy theories to people on both extreme ends of the political spectrum (Jill Stein being interviewed on inforwars.com!). If it seems over-rehearsed, I did post something similar on FB a couple of weeks back after I encountered those videos of the white students walking out of a lecture on human evolution and the black lass saying we should abandon science for sorcery.
Perhaps I did miss the point about the distinction between rationality and 'rationality'. But like I said, I've just grown so accustomed to soi-disant progressives using the word "rationalism" with scarcely less vitriol than they might say "fascism", whereas in fact the same anti-rationalist impulses are giving rise to a resurgence of actual fascism, or something disturbingly close to it, anyway.
So yeah, don't take the above posts as wholly or even mostly a response to your post. I'm just thinking aloud and, yeah, probably ranting a bit.