That's shockingly rare. I know a lot of Asians and I'm cool with a lot of 'em (engineering grad/undergrad so can't throw a rock without hitting an Asian) the females drive me crazy and annoy me, but I have never heard one say that their parents would ever be cool with them wifing up a Black guy/gal. They make it like it's the worse possible thing you could ever do as an Asian man or girl. Those countries internalized a lot of racist white values on skin easily because they already had predilections against "dark" skin because it was associated with being poor and working in the fields.