How would you feel about a family member dating someone of a different race?

How would you feel about your child, Grandchild etc. dating someone of a different race?

I ask this question because my son (16) was telling me today that he really liked a girl, but they can’t date because he’s not white… I’m pretty pissed off that they wouldn’t even take the time to get to know him as the respectful young man that he is before passing judgement. How would you feel?