#1, because a lot of people have seen the conservative manufactured outrage machine in action before. From McCarthy waving around a blank piece of paper with the names of known Communists in the government to the Satanic Panic to trans people in bathrooms to the long form birth certificate to █████ to the Big Lie to this. Bugaboos that were either imaginary or extraordinarily rare. CRT appears to be another such phantom.
#2, because as a card carrying hyperliberal California elite, former teacher and with lots of teachers in my friend circle, I'd never heard of CRT before conservatives started fulminating about it in schools. I barely grasp what it is as a legal theory, and every story I've seen shows that everyone complaining about it doesn't grasp at all what it means. Just what they think it means.
I doubt any state education standards in America incorporate CRT. I doubt any school district in America pushes CRT. What they may include is frank discussions of race in America's history and government. Something we should expect (nay, demand) in any treatment of US history. But it's clear that many people don't feel that way, and they've used "CRT" as a way to demonize anything they don't like.