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.
Biologically, there are no multiple human races. There is a single human species. Socially, there are an infinite number of races.
wiki
The use of races to distinguish people socially is playing right into the racists’ playbook by forcing you to play on their turf, where reason is out of the window.