To be honest, the racism in Song of the South is rather tame compared to its contemporaries. I mean seriously, have you SEEN the shit put out by Merry Melodies in the 30s and 40s?

Whether Song of the South is racist is one of those questions that drives animated historians nuts. It seems to be more inconsiderate than actively hateful – it looks like it's showing happy slaves, but the movie takes place post-Civil War, but that wasn't exactly a fun time either to be a black person working on a plantation, but the actor who played Uncle Remus was heavily supported by Disney to the point of getting an Academy Award… It's definitely the sort of thing that could give people the wrong idea of what the South was like at the time, though. Back in those days, the prevalent view was that Reconstruction was eeevil, which doesn't help (there's a reason Gone with the Wind, a movie that's heavily themed around the South complaining that it lost the Civil War, grossed 390 million dollars).