Josh Rosen says he's been the target of A LOT of anti-Jewish trash talk on the field -- with some opposing players telling him, "Stay the f*ck down, you Jewish bastard."
The former UCLA quarterback opened up about the anti-Semitism in football to NFL.com's Michael Silver ... saying when it comes to trash talk, "I get a lot of Jewish things."
"My nose, particularly. I get, like, 'Stay the f*ck down, you Jewish bastard … I'm gonna break your f*cking nose, you Jew.'"
Rosen says he's unfazed by the insults -- explaining, "I really like when people try to get in my head.