That's fair, but then that "rule" would also apply to the number of white/black people in the countries listed, making it lower. Doesn't make the point of considering demographics any less valid.
It is my assumption that white males living in these countries are old enough to hold leadership positions. One can safely assume a 12 year old is not immigrating to China to live / work.
Are you honestly trying to argue that the percentage of Asian American adults is approximately equal to the percentage of white/black adults in places like China and India?