Honestly, I don't know, not without doing a deep dive and i'm not interested enough to spend time doing that.
BUT, the other way this could happen is that it's how it feels that kind of person would look like if they existed.
You can imagine the type - the negative, bitter, betraying parasite that smiles at you as they stab you in the back.
Personify that and what do you get? A freakin Jew!!