So if someone who was non-Jewish posted the Jew posters up, would that be acceptable, or no?
Totally acceptable. Neither in any way disparages Jews. There's nothing hateful or derogatory about the bizarre juxtaposition of a Hasidic dude doing kung fu, or the play on the word "jujiutsu." Likewise, there's nothing hateful or derogatory about "Jewel Quest" having a sticker accidentally placed over the "-el," changing the name to the non sequitur "Jew Quest."
I didn't see the poster that the moderator removed. You and I already had a lengthy debate as to whether calling someone a "retard" as an insult was disparaging to people with mental retardation, and we don't need to go there again.