Who said it was exclusive to slavery? The context he used it in fit though.
Drake, privileged, suburban canadian mulatto who knows nothing of AMERICAN POVERTY or DISCRIMINATION puts a light on Ar-Ab while disrupting the peace and dividing the unity among impoverished, African American South Philly cats.
He used it in the only way it can be used. As a modern tool used to divide people who come from the same socioeconomic backgrounds that are impoverished because of a society that purposely treats black men and women like second class citizens.
How does that analogy not fit?