Unfair Teacher??????????

You are certainly within your rights to ask for an explanation. Your assignments should be evaluated on a set criteria. But first off, drop the attitude and get rid of the notion that because you are "Asian" that it has something to do with your grade. Talk to him respectfully - get his explanation - and go into the discussion realizing that you are not perfect, and that perhaps your work during this semester was not as good as last year's. The percentage that you earn in one course has no bearing on what you earn in another. You deserve an explanation, but if you go into the meeting with indignation and a foul mouth then you are the one with the problem.