"Opposition to what was purported to be critical race theory has been adopted as a major theme by several conservative think tanks and pressure groups, including The Heritage Foundation, the Idaho Freedom Foundation, the American Legislative Exchange Council (ALEC), and organizations funded by the Koch brothers. [...] In 2021 [Christopher Rufo] wrote on Twitter, 'The goal is to have the public read something crazy in the newspaper and immediately think 'critical race theory'' and 'We have decodified the term and will recodify it to annex the entire range of cultural constructions that are unpopular with Americans.'"
"The Economist and Reuters have conducted polls on how much the general public understands CRT, a 'once-obscure academic concept', and they found that most people are unfamiliar with CRT and misunderstand it."
(From https://en.wikipedia.org/wiki/2020s_controversies_around_cri....)
It is absolutely a conservative boogeyman and (for the most part) has never been a taught subject outside of college.
I would assume you also oppose teachers getting their Master's in education? After all, that's not a subject that has never been taught in any primary school ...
There are probably legitimate criticisms of recent changes to public education, but it's never the things that Republican politicians harp on.
Also, for what it's worth, much of what my generation was taught in school was utter bullshit: https://en.wikipedia.org/wiki/Lies_My_Teacher_Told_Me. If anything, the idea that my children would be taught that the Pilgrims and Indians were best friends, that Columbus was someone to look up to, or that the Civil War was really about states' rights is what would compel me to homeschool, not "liberal indoctrination." But many, like DeSantis, still appear to believe that these lies should be taught.