Why are black women so bitter towards white women dating black men?

It's a free country and people date outside their race all the time but I have noticed that when a white woman dates a black man, black women have something nasty to say about it! Why would that offend black women?
Update: Trust me, I'm not racist! I'm married to a black man and love everything about him and his family and where he comes from! I have heard personally totally out of line, rude things from black women's mouth... attacking me for being with my black husband! So if you ask me... that is RACIST!!!!
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