I find that the majority of people wanting Song of the South buried haven't actually watched the movie but are simply told by the media that it's terrible. Instead of finding it racist, I thought it was a good message that a white boy can learn from a black man. I think it's a good thing to show hope of racial reconciliation rather than spread the message that blacks and whites must continue to hate each other for what happened in the past. Plus, the movie really helped African American representation in film in an authentic way. In my opinion, developing African American characters like this is far better than the virtue signalling race swaps that Disney loves to do now.
As others have already said, there are far more problematic scenes in other movies such as Peter Pan that don't get the Song of the South treatment. Even if it could be argued that some depictions in Song of the South aren't the best, I think that a disclaimer is far better than hiding it away from the public. I really don't agree with taking political correctness to the extreme so that nothing can ever be said for fear of offending someone. Disney has even gone to the point of cutting Zip-A-Dee-Doo-Dah from the Grizzly Gulch Welcome Show in Hong Kong
Disneyland. In the show, the characters used to say that when people in Grizzly Gulch find gold, they like to say Zip-A-Dee-Doo-Dah. I'd be hard to argue that African Americans who can't even see the show right now because of COVID entry restrictions would be offended by the song used in that context.