Thanks for all the input guys. And bamafan, I did think about traumatic repetition and etc etc when I made the post 'generalizing'. It's just that I didn't feel like going on a long theoretical explanation about how generalization hurts blah blah. I think that TakeruK is spot on about things and I don't have anything else to add to his case.
This is it, essentially. I happen to be fluent in English and I hate it when people assume that I'm not simply because of my nationality. I don't think that it is unreasonable to feel aggrieved about the general (flawed) assumption that international students can't speak fluent english even though this may hold true in some cases.
Why hate? Because it is ridiculous to deny that the psychological structure of such sentiments is related to sentiments that result in discrimination against any minority. I challenge people who argue otherwise to push that claim. It seems fair to conclude that most prejudice is not intentionally discriminatory. Hardly anyone who is racist, chauvinist, etc would think of themselves as such. Instead these people rely on 'facts' to prove their opinions 'right', and then use examples to prove their point about the group. Of course whether one has examples or not is not the point. The point is that such thinking is pernicious to minorities. Much of racism etc involves, as TakeRuk points out, a negation of the individual which involves subsuming him/her into a particular group (presumed to be homogenous) and then subjecting him/her (whether intentionally or not) to discrimination based on the assumptions regarding that particular group.
I don't buy the thought that speech isn't action. Speech act theory would bear this out. So statements like 'international students can't speak english' are discriminatory and hurtful.
In this case it's more of a theoretical gripe than an actual one. For if we suppose that anonymous people behave like that.... but that's what makes up society -- individuals -- and at the end of it all these individuals affect (and effect) policies and social norms/ attitudes etc.
As to how to deal with the hate, I suppose since Bear Mace isn't a viable solution, drinking and working on journal papers is