I want to say always has been but I can't recall for usage since it first appeared, but for a very long time, I would say it's associated with being white, and supporting a white dominated country. I mean, what is the Patriot Front?
en.wikipedia.org
They have the name right there and it was founded in 2017. I already said it, someone with a visible American flag is suspect to me, as I don't see what there is to be proud of about America, personally speaking, and in most cases, at least down here, right behind the America is a Trump flag.
Patriot Front - Wikipedia
en.wikipedia.org
Patriot Front
Monitoring over 1,500 active extremist groups and dismantling their influence – promoting safety and justice nationwide.
www.splcenter.org
They have the name right there and it was founded in 2017. I already said it, someone with a visible American flag is suspect to me, as I don't see what there is to be proud of about America, personally speaking, and in most cases, at least down here, right behind the America is a Trump flag.