Not everyone thinks this, but I know an extreme right-winger who thinks this. He is also a conspiracy theorist who thinks non-white people are out to get white people so, yeah, odd.
Not every immigrant is illegal or bad. I know a girl who didn’t speak English for 3 years when her family legally immigrated, so of course she’s been told this.
The oligarch owned media/government/education system wants the working class fighting each other rather than going after the real parasites (the oligarchs). They use 24/7 cradle to grave propaganda to convince people that the threat comes from “others” instead of the bosses. Easier to get people to punch down.