The thought I believe Fey was trying to convey, in "bitch is the new black", was, given what is passable for network tv, was in fact "bitch is the new nigger". Let's not be coy with what she meant. Frankly I find it completely repulsive.
It would seem that there has been some degeneration in this election cycle in terms of individuals who are invested in proving that the oppression facing women in this country outweighs the oppression facing Africans in America and African Americans in this country. This is the implication of 'bitch is the new nigger', as if society has already overcome its latent racism (which Fey's remarks highlight rather than diminish), and that now what really matters is issues of gender. I find quips like Feys, coming as it is from an affluent white woman, to be debilitating to the cause of universal human rights, and in actuality reflect the privilege that her white race affords her.
Yet if we are to truly serious in regard to issues of race and gender, then we must be willing to acknowledge our privilege at all levels and denounce oppression whenever it occurs, rather than be drawn into some churlish cockmanship of 'my oppression tops your oppression.'
The fact that there has been NO critical response to this comment by Fey, including it seems from you all (much to my surprise since I usually enjoy your blog), and the extent that it is taken as amusing by so many (to the extent that that night's episode was highlighted by a presidential candidate during a nationally televised debate), suggests how far we have yet to go with regards to race.
And so, 'nigger' is still 'nigger.' 'Bitch' is still 'bitch.' I don't find either particularly amusing, but maybe I just don't get the joke.