To be honest, I find asian/international students the worst when it comes to talking in lectures. This *may* be because I do a course in which 70%+ are asian, but it's just extreeeeeemely distracting especially when they talk in other languages. There was some asian chick who sat next to me with her friend half way through a lecture during the week.. And did not stop talking the whole time. Fair to say I was fairly pissed off by the end. I've never really had a massive problem with any local people, but again that might be because of my course.
Yes it's probably uncalled for for them to label you all "international" students, but let me tell you it's bloody annoying to put up with.