I'm sorry you came up against this issue. I'm afraid it is very common, in even in big, multinational companies. As your colleagues said, it's not personal, and not aimed at you specifically. They don't even see it as anything wrong. I just ignore it, pretend it never occurred, and carry on regardless. My German colleagues get it as well. They'll do the same if you're black, jewish, asian, whatever.
My wife gets really p*ssed off when people make snide comments behind our backs when we speak English between us, or if they spot the slight accent she has after years of living abroad, and make, what they think, are funny jokes. Guaranteed to get the perp a mouthful of French words I don't understand. I just ignore it.
Don't let it put you off. You will develop a think skin!
I agree, take pride in the fact that those who make fun of or blame you or whatever convenient minority are far less likely to get themselves out of the situation that they are seeking to blame others for than you are.
It sound like you have already risen above them.
Oh, and you might just mention the quarter of a million (at least, see this - admittedly old but I doubt it's gone down much - article http://www.guardian.co.uk/uk/2008/mar/23/immigration.france ) French people in the UK taking jobs from Brits. Of course I don't subscribe to this theory but it is a statistic that usually shuts these ignoramuses (ignorami?) up.
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