One thing that seems to be common is that there is always a large preference for lighter skin coloured people in our world, and this seems to be among most races. All my brown friends have told me about how their parents are happy to see their kids go out with lighter coloured brown people than darker coloured. I also so a documentary a while back regarding how black people were racist among each other in a similar way, where the lighter skinned blacks made racist remarks towards darker skinned blacks. It's terrible that even amongs their own racial group, people exhibit a brand of racism.