Critical Race Theory, like all Critical Theories is from the Frankfort school.

https://www.britannica.com/topic/Frankfurt-School

Critical Theory is an attempt to reimagine Marxism with a moral dimension. The moral dimension being (to simplify) "Why didn't the workers' revolution occur?"

Critical Race Theory starts with the axiom: "The purpose of western civilization is to advance the interests of the White Race at the expense of the Black Race."

From there CRT concludes that the institutions of western civilization must be undone so that racial justice might be achieved.

When laid out simply like this, it is easy to observe that CRT is both fundamentally mistaken (starting from a conclusion and working backwards) and downright evil, in that it would return the world to stateless barbarism in an effort to accomplish ideological ends.