I mean look, you can have a racist, reactionary, murderous regime built around any in group cast as the true nation, and any out group cast as the threat to that nation/culture/in group. But for whatever reasons, fascists specifically just tend to import the white supremacy and antisemitism whole cloth, and then carve out exceptions for the in group in question. There are fascists in Asia who ain't never seen a real live Jewish person in their lives, still super concerned about "the Jews" etc