As a American I only see this with other Americans. You never see Swedish people doing this, you never see Polish people doing this and you never see South Africans doing this.
I remember when ancestry kits became popular and everyone was walking around telling people about how they “1% Finnish, 3% native American and 25% Italian” etc… etc… even Elizabeth Warren had her blood tested to prove she was native American. I think she was like 2% native American or something.
Kinda like how “schizophrenia” is used to describe anyone who’s a bit weird or how “autistic” is used to describe someone with a interest in something.