Such things cut two ways.
(R) call immigrants and the poor by these words.
But don't forget about "trust babies" who "haven't earned their money" and "do nothing." They also get the soubriquet "parasites" and "shirkers," for precisely the same rhetorical reason.
And while we tend to question those who decry all those disloyal "ferners" we are also all-in when it comes to internationalist corporations who fail to have a clear allegiance to our country.
Saw a pro-Sanders post here yesterday that talked about helping "our people" or "my people", Americans, and pointedly drew a distinction between "our people" and the 1%, who, consequently, aren't "our people." And presumably not "true Americans." The point isn't that Sanders or his supporters are especially prone to this. The point is that this kind of rhetoric is reprehensible when "they" do it, causing the neighborhood to reek of sulfurous fumes and making daffodils and lilies wilt, but good and just when we do it, encouraging puppies to lick our faces and kittens to purr in our laps.
Right down to the suppression of those we dislike by legal or violent means.