I did not sell the customer one of our drinks since they were a foreigner.
People should not do things like this. Everyone should be treated equally.
I can see your point, but "both are evil" is not what I meant. I'm really not interested in them.
None of that matters. What matters is that you discriminated against someone based on their country of origin and that is wrong. Don't do something like that again.
I don't care, they leave me a bad impression by knowing different languages and looking exotic.
How they look should not cause you to treat them any differently. Someone's ethnic makeup is only a very small part of what makes them who they are. That could have been one of the nicest people you would have ever met.