That's not what he's suggesting. Rather, he's suggesting that the schools separate teaching how to communicate amongst themselves v. how to communicate in a mi

That's not what he's suggesting. Rather, he's suggesting that the schools separate teaching how to communicate amongst themselves v. how to communicate in a middle-class manner, and not label the former "wrong" and the latter "right," but rather the former "personal" and the latter "formal." That's not different from students of yore having to learn Latin to get along in college: it wasn't that they were speaking English (or French, or German, or whatever) poorly, but rather that Latin was required to get ahead in the world. Same thing here.