hi JJ, am an international student and in my experience, no matter how much unis sing about equal opportunities, there are always those members of the faculty who look down on ethnice minority students. you have the following options: i) stand up to ur supervisor- don't give him the satisfaction of knowing that he is getting to you. ii) could it be different culture? sense of humour?? ask yourself these questions.
if it is, try to adjust to this strange character and get on with ur phd. iii) let your supervisor know that you feel offended by a particular thing- if he is approachable. iv) speak to your tutor and to the dean if they don't follow it up. in my first year, i chose to prove myself. i never gave the professor the satisfaction of getting to me.
Looking back, i wish i would have given him a piece of my mind or at least mentioned this to someone. in my masters this year, i approached the dean of studies and he agreed to get me a new supervisor. don let anyone harass you. you have every right to be here and you are just as equal as everyone else. stand up for yourself. no matter the cost. your supervisor couldn't possibly know enough people in this world to ruin your career.