Discursing on a topic often treated by linguist John McWhorter, Ta-Nehisi Coates nails this insight about opponents of the African-American dialect of English:
... the desire to patrol someone else's accent strikes me as deeply incurious. It is intelligence as artifice, a knowledge garnered to, at best, kowtow to equally incurious people or, at worst, preen over others who aren't as fortunate.