Why does my fiancé continue to make jokes like this?

We have been together two years now and I can’t help but notice that he makes certain jokes that really hurt and offend me. He says sorry but it seems he cannot help himself. I’m a black female and my fiancé is white. I’ve never looked at race being together. He keeps making jokes calling me, “black on the outside and white on the inside.” or saying “you’re the whitest black woman I’ve ever met.” and “you’re a white woman with an ethnic name.” When I ask him why he says it’s because of the way I talk and behave and then will compare me to and make jokes of the “stereotypical” type of black women he’s seen or come across. I’m the first black woman he’s been with between.

Why does my fiancé continue to make jokes like this?
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