Is the word "foreigner" really an insult and when did it become one?

Valso

My first language isn't English and when I was still learning it, we were taught that "foreigner" means someone who is from a different country. So I've always used the word "foreigner" when I describe myself or people from other countries, depending on the context and the topic. But not long ago I was told that "foreigner" was an insult, so I started using "outlander" in its place.

But that doesn't make much sense to me. Is "foreigner" really an insult and when did it become one? I've missed that moment. At this rate some day they're gonna announce that the word "car" is an insult too...

Is the word "foreigner" really an insult and when did it become one?
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