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I remember when one of my Chinese-American friends introduced the soon-to-be (white) mother of their child to his mother, she remarked that his fiance was "ugly." His sister, on the other hand, was free to date any white guys she pleased. Likewise, other friends invloved with Asian guys initially met great resistance with the parents (while they seemed to love the white dudes the girls brought into the family). In one couple, the woman still has to deal with the "fat" remarks 20 years later!
I don't give a shit how many generations have preserved the status quo, it's never, ever acceptable to call your future daughter-in-law, "ugly."
Furthermore, this has nothing to do with the men in question. Obviously in the above cases, these awesome men stood up for their partners. You're going to find spineless mama's (and daddy's) boys in every culture (you can almost substitute the LW's plight with overbearing Italian or Jewish parents). It's up to the individual to break tradition.
With all the Asian female-white male couples around, you have to wonder why this doesn't come up more often...it's the double standard.
Can you imagine that Visa commercial with the genders reversed??