Yes, she was white. And Tiger Woods' mom was Thai. So I'm not sure of the point in that.
Sure, he didn't follow what's considered the mainline of American black experience. But it's that same logic that has many African-Americans saying African-Africans "aren't black."
The trouble with this logic is double-sided. On the one hand, most people generally know that stereotyping a black person isn't the right thing to do.
But when people are disqualifying a black person because they have a college education, they don't talk in jive, they listen to (or play) country music, they have a decent job, the men participate in their children's lives, they marry a non-black person, etc., then you get blacks branding themselves with negative stereotypes. Either you live up to the drug-addled, alcoholic felon stereotype or we disown you in our black culture.
Uncle Tom-ing is just another form of racist stereotyping, except it's often blacks against themselves.
There are parallels in feminism. There's the idea that we live in a rape culture, all heterosexual contact is rape, and anything less is a sellout to women's advancement. And then there's the idea that feminism gives a woman the right to be accepted as a stay-at-home mom if she wants, to be a prostitute if she wants, to marry a husband and take his last name if she wants.
So the question becomes which side is more empowering? The one that believes blacks should only live up to negative stereotypes to be accepted? Or the one that recognizes that black people are capable of much more of than that?