I'm not a moderator, so that's not really a relevant question I don't think. I don't think referencing times of oppression and times of violence and making light of that is acceptable or the sort of language that lead to those incidents.
I've been trying to find a good base to start from and honestly I struggle to find something consistent. THere's one guy I like to watch who has cerebral Palsy, I believe his name is Josh Blue. He makes fun of himself while making fun of others. The man walks onto stage with a shirt that has a picture of a broccoli on it (He's a vegetable.) But going beyond that...
As a parent, I would think that the better side of racial stereotyping in humor would be to find positive traits that can be stereotyped to make the joke. But then, people differ on what is a positive trait and what isn't. At that point, it's how you spin the narrative of the joke. For instance one is a joke about a job you didn't want to take because you didn't find it fulfilling.
Negative examples would be like, "The mexicans are going to steal that job too." when instead you could say "And here's the mexican guy with his damned stupid strong work ethic "I'm here boss." And now your boss has a better employee than he did five minutes ago.
This is a largely armchair opinion without researching amongst comedians what racial humor is okay. The consensus among the classic mega-star comedians (George Carline, Robin Williams, Richard Pryor, etc.) is to "Punch up" to the majority, don't punch down the minority. THough, if you want a more informed decision, I'm willing to look at sources people may want to supply while I would be supplying my own as well.