I have a very good friend who is young, black, and "articulate" -- and who was told (by his mother, of all people) that he "wasn't black enough" because of the way he spoke.
We had a long conversation one day about his often feeling like he didn't have a group he belonged to. Most of his friends were white, but he often still felt like "the black guy" and he didn't really feel at home in the black community either, in part because of statements like the one his mother made and in part because of his sexuality. What Du Bois referred to as "double consciousness."