Resenting a whole country because ex comes from there?

My best friend used to date someone from a different country. Since their (very ugly) breakup, she told me that she can't stand anything or anyone from that country because they all remind her of her ex. She feels bad for feeling this way, she knows it's unreasonable, and she wants to change these negative emotions. I never had the chance to date anyone from a different country, so I couldn't really relate and I couldn't give her any advice. Have you ever felt this way? And how to stop resenting a whole culture just because of one person?

Resenting a whole country because ex comes from there?
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