Sure. No one is saying that the person is bad for saying it. Indeed, they're probably a good person, and for that reason may be interested in hearing why the phrase is better avoided. Particularly if their regular travels (friends, work colleagues, etc) may not put them in contact with indigenous people.

Certainly. I do not think the majority of the people using the phrase are racists that want to see the continued subjugation of indigenous peoples.

But we should educate them on why the phrase is one that should be avoided.