I guess I'll play devils advocate and ask why it's not ok for a white woman to dress as a geisha? Or for that matter a black man? If gender can be fliuid why can't race or culture? Imo people get upset way too easily and want to control what others can and cannot do. If someone wants to rave in faux native head dress I say go for i if that enhances their trip. Why can't an Asian guy wear full cowboy gear? Or colonial clothes or even a uniform from the civil war? IMO Nobody owns a cultural copyright on those even if they think they do. We're just too afraid that someone might get offended and that we get offended in anticipation that someone else might. As for Mongolians and sushi its kind of a weird example, if someone cooks a lot they may very well know how to make it. If they don't they probably don't know, regardless of ethnicity. We live in such a global society it's silly to limit oneself to only food or dress from your own little ethnic sub group.