In an essay in Harper's titled "Tense Present"[0] David Foster Wallace, in addition to surveying the prescriptivist/descriptivist landscape, has an aside where he describes a conversation he has with black students of his who write in "standard black english" (vs "standard written english"). It manages to touch on language, class, clarity of communication and political correctness in a way that still seems timely today. Plus it's funny.

It begins at the bottom of pg. 16 in the PDF (or pg. 53 in the magazine).

[0]https://harpers.org/wp-content/uploads/HarpersMagazine-2001-...