> I’ve worked on many multinational collaborations, and I notice that European researchers often speak to each other in their native languages. However, it’s relatively uncommon to see Chinese or South Korean scientists talking to each other in their own language in an academic setting away from their home country. They just don’t feel comfortable.
In my experience, Chinese are one of the most likely to form little cliques with their compatriots when abroad (and speak their own language while at it). They're not the only ones to do so, but they definitely seem to do it more than average.