A few thoughts, then.
One, there's a school of psychology which holds that the most telling, information-rich aspects of a psyche, a society, a system of any sort, are its pathologized elements:
So, sharing the minstrel show's stage with the cakewalk, we have the image of a physically handicapped stable hand upon whom the Jim Crow character is based. It's an image that survives into the poses Donald Glover strikes in This Is America.
