Because people are conflating history with the college course of CRT.....simply knowing a said thing happened in 1922 , for example, the Tulsa massacre would be called CRT by the same the folks who claim they don't mind students learning "history" -- but to everyone else, it is just history...
What CRT does is go into detail about how state and local government aided the white supremacists in that massacre and how millions and millions of dollars of wealth in land and property was snatched from the victims -- with ZERO compensation...thus affecting generations of their offspring....that is CRT