I knew this was your original angle all along. If the Obama critic is "black", and Obama is "black", then we can rule out race as a motive. Therefore what the critic says must be true.
Interesting. As a black, he must be ruled out as a racist...but...he could still be considered an extremist as a critic of Obama. Just ask Ben Carson. He made the SPLC watch list! But after outcry, was removed from it. That was laughable. He was also audited for his criticism of the O. If I'm not mistaken, so were members of his family. He was never called a racist, though, just an extremist.
All I'm saying, and don't read too much into it because it's really quite simple, is I can't say anything about a left wing person of color, whether it be calling a name, or simply stating criticism, without being labeled racist or extremist by the left. Not complicated, just fact. Just watch the GOP in action. They are so fearful of the racist label that they are frozen by their own shadows. I don't see the same when conservative blacks are called all kinds of names by the left. Neither do you.