Love is a matter of the heart. If they complete each other, just wish them well. The hatred for a minority marrying a white, is a clear example of the person spewing the hatred, being a racist.
Some people of color complain that they are victims of racism and should be looked at as only equal person (which technically they are....the complainers have just been hearing that they are victims of racism for so long, they believe it) yet, when two people of different race do accept each other as equals and love each other, the true racists complain.
There is no institutional racism and while "individuals" of any color can be racist, in the US, there is NO occupation, "Glass Ceiling," that minorities can't hold. The very highest position in this nation was held, for the maximum two terms, by a black. He couldn't have been successfully elected as president, if only blacks voted for him. Citizens of all races voted for him. There are black physicists, black, astronauts, black business owners, black doctors, black nurses, et cetera, et cetera, et cetera. There is literally NO occupation a black can't work in, if that individual ensures that the school he/she (or whatever one calls themselves now days) is giving a quality education, studies hard. Remember though, you can have equal opportunity....OR....equal outcome, but you can't have both. Not everybody is suited to be a doctor, rocket scientist, head of a corporation, lawyer, physicist, et cetera, as everybody has their own level of intelligence and competence.