How do you deprogram millions of brainwashed idiots that barely finished highschool?

You educate their kids and wait for them to die, unfortunately. I mean in essence, the PC movement as a whole has worked for the most part, it’s a slow gradual grind over many years, decades for some, tirelessly continuing to etch away at their bigotry.

But in short, to truly get rid of it, you wait for them to die.