I'll have to be kind of vague mostly so I don't implicate anyone in specific, but generally it's the same sort of fetishizing as weeaboos get into. Obsession with but poor understanding of the culture, trying to insert themselves into conversation/talking over people who are actually jewish about jewish issues/culture/whatever to prove how much they know and to feel involved, misuse of hebrew or yiddish (there are more jewish languages but people don't seem to remember they exist) because it's so 'exotic', etc. There are more harmful things of course (the jewish seductress stereotype, for instance) but I haven't seen them in rp.

In general this seems to fall under the realm of that people often forget jewish people still exist outside of this far-off concept, like often happens with first nations and romani people. So we end up more a interesting, sometimes mystical, foreign-but-not-too-foreign idea that gets latched onto and extrapolated out as a concept instead of actual individual people, and this is both in general and in rp. If any of that made any sense.