When it comes to anything to do with race, gender, sexuality or politics is better to do research elsewhere than ask HN. This is the relevant text from the first couple of paragraphs of Wikipedia's page on CRT:
Critical race theory (CRT) is a cross-disciplinary intellectual and social movement of civil-rights scholars and activists who seek to examine the intersection of race, society, and law in the United States and to challenge mainstream American liberal approaches to racial justice. The word critical in its name is an academic term that refers to critical thinking, critical theory, and scholarly criticism, rather than criticizing or blaming people.
A key CRT concept is intersectionality—the way in which different forms of inequality and identity are affected by interconnections of race, class, gender and disability. Scholars of CRT view race as a social construct with no biological basis. One tenet of CRT is that racism and disparate racial outcomes are the result of complex, changing, and often subtle social and institutional dynamics, rather than explicit and intentional prejudices of individuals.
CRT scholars argue that the social and legal construction of race advances the interests of white people at the expense of people of color, and that the liberal notion of U.S. law as "neutral" plays a significant role in maintaining a racially unjust social order, where formally color-blind laws continue to have racially discriminatory outcomes.
https://en.wikipedia.org/wiki/Critical_race_theory