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Doing some more research. So Song of the South is based off of the old Uncle Remus stories written in the late 1800s. The books were written by an author as he went around Atlanta and gathered a bunch of local folk lore from former slaves and plantation workers. A lot of these stories of course were only passed down orally, so he compiled a bunch of them for his book, created Uncle Remus as a mediator for the story to tell to a group of children like how griots in Africa tell stories to their village. The dialect in the books was actually praised at the time for being very authentic to what a lot of black southerners sounded like, he went out of his way to try and capture an authentic feel for it as it would add to the story telling much like Mark Twain did in Huck Finn.
Walt being from the South grew up with these same stories and loved them and that's why he committed to making the movie. He actually fought for the actor who played Uncle Remus to receive an Oscar. Remember, this is in 1941, more than twenty years before de-segregation in America. While yes, the movie is very sugar coated in it's portrayal of the reconstruction south, that's sorta' the point, it's supposed to be an innocent gateway in for kids.
Anyways, liberals who are trying to appease black americans just wiped out the last of some of their genuine real folk lore and history. They think they are winning because "black kids can now see themselves on a ride because TIANA" but dont realize that Br'er rabbit is supposed to be a black child outwitting and outsmarting dumb slave catchers.