Like most articles of this type, this article focuses exclusively on the upwardly mobile. And why not? They are usually interesting productive members of society. But downward mobility is a thing too, and you almost never see an article about class mobility talk about that side of it. I guess the idea is that the downwardly mobile aren't interesting, or deserve their fate. The downwardly mobile have children too. Learning to lose the manners of the ghetto when living among the upper class is quite useful , but learning to hide the manners of the upper class when living in the ghetto is often a matter of survival.