After learning his lesson from God, he tries to push on to everyone that complexion doesn't matter and everyone should love one another, not hate. It doesn't just talk about white vs black. It's about dark-skinned vs light-skinned. To this day there is still just as much hate between black people as there is between blacks and whites. This song is talking about ending all of that and how it's unfair and wrong.
To Pimp A Butterfly was amazing and what an album should be...and while I wish there were some TDE appearances, I wont be picky. I loved everything about it. The grade doesn't matter. You should know what it is.