Personally I believe that large parts of this discussion and topic are simply human nature.
Any group with power, will seek to keep that power, and to increase their standing over the other people. If history had played out differently and asian or black people were the historical in-group we would have the exact same situations and issues as we have today. Only another enemy.
I agree. People tend to ascribe inherent traits to other groups, when in fact observed behaviors can usually be traced not to inherent dispositions, but to specific environmental conditions that incentivize said behaviors.
For instance, a white man in our current social environment who exhibits a confident, assertive attitude is well situated to succeed. White men are expected to be competent and often rewarded for appearing competent, so they sometimes attempt to exaggerate their competence in order to meet the perceived expectations.