Prince Harry and Meghan Markle are engaged. Why do people make such a big deal about unions between whites and blacks?

I see a lot of comments about Harry being stupid for marrying a black girl, even though she is mixed.

I also see a lot of racist comments calling her a monkey.
I also see racist comments from black girls calling Harry an ugly little white boy and then black girls congratulating Meghan on "finessing" a white boy and gold digging/scamming him out of his money.

Why can't people just mind their business?
Why do people only get upset when whites and blacks marry but never seem to care when whites and Asians marry or whites and Hispanics?
Prince Harry and Meghan Markle are engaged. Why do people make such a big deal about unions between whites and blacks?
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