White men generally prefer white women. It's a theory. It's not racist or bad or surprising as it's human nature to prefer someone with a similar racial or ethnic makeup. Everyone has this type preference naturally. You even see this natural preference in babies but studies have shown that around age 2 to 3 is when a percentage of white children raised in our country start to show skewed preferences for non-white faces over ones that are the same race as them. However, you do see the same effect in non-white children (i.e. developing a preference for nonwhite faces).