First off, CRT isn't even a thing beyond a graduate-level sociology theory.
However, a right-wing hate monger, Christopher Rufo, turned it into The Far Right's new boogieman on the Fox News channel.
The catch phrase became a fresh, new approach for racists to hide behind the mask of "Concerned Parent" to rail against ANYTHING smacking of 'diversity' in our schools.
My State had a candidate for Governor who came out with TV ads telling our fair citizens that if his opponent was elected, we'd start seeing "CRT"....(cue ominous drumroll...) taught in our ELEMENTARY SCHOOLS!!!
I don't know what's worse -- that politicians resort to this kind of dog-whistle bullsh*t, or that there are a hell of a lot of people in this country who eat it up.