Not considered correct--just socially accepted as the best?

When reading the article bidialecticism I found myself wondering how we can teach children that all dialects are equal, while at the same time telling them that only one is considered the most socially acceptable and will get you further in the professional world? It seems like what we are really teaching them is that we can't outright label standard english as correct...yet it is what you need to learn in order to stay on top in our society? We say SAE is not the only "proper" form of english, yet we judge every other dialect in comparison to it. I am having a hard time understanding how to teach my students about this topic without sounding like a hypocrite.