[ivraatiems]

I think you're right that this happens in all the scenarios you mention.

But I'm certain the first and third example you've given aren't just "not socially accepted," they're actually illegal in the United States and many other places. The second one is questionable but may also be illegal, depending on whether the issue is actually English competency or just "he's foreign."

Only the fourth one, which is based on the person's behavior but not their membership in a protected class, is anything like what "culture fit" can or should legally be used for.

I agree with you that this kind of discrimination-by-another-name is status quo, but are you okay with it? If no, what do we do about it? If yes... why should I be?