The truth is, you can’t categorize an entire nation into one person or a few. The part you want to name in one word or another must be the majority. Or the nation you want to categorize.
If you have a bad customer or two at a store where several nations come, several people from several countries, will behave badly, it doesn’t mean that everyone in that nation is like that.
If your co-workers or a social others persons from a group of people behave badly, it doesn’t mean everyone is.
Just because a woman or a man betrays you doesn’t mean everyone will.
If you don’t like a food, does that mean it’s bad? It can be bad or good, but you just may don’t like it.