Somehow, Chinese think the white race is superior to Chinese race, so think the white men are better than Chinese men, therefore, the white men should have more beautiful wifes, and they criticize the women who marry to whites (thinking they are not pretty enough).
Have you seen urgly women who have Chinese bu*****ands? You think it is normal, but if the same women marry to white guys, you think they are not good enough for the white guys.