A black-faced minstrel is just racist, but a dancing rabbi would be hilarious.
I'm Catholic, and I see Catholic jokes in the popular culture all the time. Should we ban Father Guido Sarducci? No, it's great!
I don't know, maybe I'm missing something. For the Jewish folk on the board, is there something gravely offensive about a dancing rabbi that I'm missing? If so, I apologize, but I'm pretty sure I've seen similar humor in Mel Brooks movies.
Depends on the context. Let me give an example:
The Pittsburgh Pirates' organist often plays Hava Nagila, the traditional folk dance song we play at weddings and bar/bat mitzvahs, just to rile people up a bit and get them clapping. It's a catchy song and a particularly harmless piece of cultural appropriation. It's done in good humor and solely for fun.
If the Pirates debuted a mascot or fan race set to Hava Nagila that involved chasing after a pile of cash, that would be pretty offensive. If they took the next step and dressed the contestants in black hats and long beards, it would be even worse.
Context, and intent of things to be communicated, matters.
And for the record, Mel Brooks movies are funny, Jewish humor is definitely a thing, and we're already overly inclined to poke fun at our own stereotypes.