I think it's a pretty big assumption that just because someone chooses to focus on white privilege (perhaps because whites are the privileged majority in the society they live in) that they are unwilling to acknowledge that other societies have nonwhite privileged majorities.
I am not sure what you mean by any majority privilege being "earned". It seems to me that it's just a fact of being the prestigious majority, and minority groups being seen as more out of place—given a spotlight to highlight their flaws, if you will, that would not necessarily be noticed if the same people with the same flaws were part of the majority group.
Well, if you think white are privileged in America and that you as a black person were robbed from your mother land because of slavery and that black people have the privileges in Africa, why not go back to mother land?
Couldn't you by that logic then also say if white people complain about XYZ, why don't they just leave America, Australia, Canada, etc. give it back to the natives and go back to Europe, lol.