There’s a lot of hyperbole on both sides of this issue. The right characterizes CRT as a cudgel liberal educators use for bashing white children, while a lot of folks on this sub are characterizing opposition to CRT as being opposition to education on the very real history of American racism.
There’s also a huge difference between CRT in theory, which is a rather dry academic lens through which racial disparities are analyzed, and CRT in practice, which is subject to some very legitimate criticisms. It’s also important to note that opponents of CRT use it as something of a catchall term that include “wokeness,” “social justice,” “cancel culture,” and “anti-racism,” all of which are subject to certain excesses. These excess are the impetus for anti-CRT laws.
To give you an example of a CRT excess that has upset people; a public school in NYC distributed a handout created by a Northwestern University professor that encourages students to “dismantle the regime of whiteness” and states that all people who identify with whiteness fall on a spectrum from “white supremacist” (bad) to “white abolitionist” and “white traitor” (good).
This isn’t representative of CRT generally, but it does shed some light on opponents’ rationale.