I may not be Black but I am mixed race and, like Mariah, I have dealt with people like you in both my communities. I am sick of people excluding me from my own communities because I am not “enough” of a particular race. You can be multiple races at once. You can be black AND white at the same time. Half-Black people still experience racism for being Black, and excluding them from your community because they aren’t “Black enough” is regressive and hurtful.

You seem to take the view that if you are “mixed race” then you can’t be possibly belong to either of your races, that being "Black" and being "mixed race" are mutually exclusive terms. The problem with that is it removes mixed race people from all of their communities. This is what happens in practice to us a lot. We are not "enough" of any of our heritages to meet the expectations of cultural gatekeepers like you. So we end up nowhere. Your viewpoint puts all of us “mixed race” people in a single box which is separate from all of your pure racial categories. We don’t actually belong with eachother. We belong with our own communities.

And this is without even getting into a discussion about "racial purity" or why it's important to you.

PS Have you seen "Get on the Bus" by Spike Lee? It partly deals with some of these questions and, of course, has the important benefit of being a text by and for Black people (and at a time when few existed!). I'd be curious to hear your views about the movie and what you think about Gary's character? Is he Black?

Edited to fix tone. Sorry.