Depends on the problem. Also is he your international student advisor or your thesis advisor? Usually advisors are nice, so talk to him. You know misunderstandings are common. If your thesis advisor is giving you a hard time, then remember its for your own good. Professors are demanding and its not easy to graduate. But if your advisor is being "rude" for no reason, then you can petition the academic council/committee.. but this is going too far. Be polite, be nice and talk to him.. dudh dine gai ko laat khanu parcha kahile kahi.. k garne? If the prof said your paper is trash, then that's not being rude. Intead of feeling bad and humiliated you should be happy because he read your paper, and is giving you his sincere opinion. So thank him and rewrite your paper/thesis.