Although I’ve never been to Canada, I feel qualified to comment as an Asian-American immigrant. First, I gotta say that being rude or unfriendly to others is not part of any Asian culture that I’m aware of. I think it is fair to say, however, that many Asians tend to be introverted or ‘shy’ or ‘quiet’, and that is atleast partly attributable to culture. As for your assimilation question: I think most young immigrants, or children of immigrants, quite naturally want to assimilate to their new culture, and usually do so quickly. However, assimilation is not the same as acceptance. I think the main reason that alot of Asians, especially in a college setting, tend to gravitate toward each other, is not because they are still clinging on to their native cultures, but because they know they’ll be accepted by each other and not judged by how they look.