When I came to france, there were regular errors about my capital, brands etc from my home country (Sweden), which is okay, especially in the pre Internet times. But there were these arrogant people brushing it off like it doesn't matter because it's just some small country or whatever. My live with them was "no problem mate, we all do these kind if errors, like what's the capital of France, Berlin, Paris, Madrid? Who cares!?"

That worked surprisingly well, I'm just baffled no one had a brain aneurysm. Some were so angry.