Nothing at all, provided you know how to read the room.
Like, categorically? There is nothing you shouldn’t joke about. Everything can be ridiculed.
Hypothetically, however, there are a lot of things you shouldn’t joke about if you want to be considered a decent person, but that depends on who you want to consider you as a decent person and to what extent.
[03-18-19]
It's not 'what', but 'how'. That you can't talk about a thing makes it funny for that fact alone.
Death, rape, molestation, religion, politics, murder, personal attacks, child-rearing, severe injury etc. etc. …should throw up some warning flags, if not just left in the hands of professionals ( … if that even ).
I don't believe in completely blacklisting any topic - who gets to draw 'the line' about what's acceptable or not? Evangelical Christians? Left wing progressives? No matter what line you draw, someone is going to a) be dissatisfied with it and b) intentionally go over the edge. It's the nature of comedy... good, effective comedy is rooted in truth, and the truth is often unpleasant and/or uncomfortable. Everything is OK or nothing is OK, you can't have it both ways. One of the bigger issues here is that hacky comedians go to 'edgy' material because they can't craft jokes well - they are lazy and hacky and using that kind of stuff will get them some quick attention and they can sell themselves as a 'bad boy of comedy' or whatever
Now all that said...You wanna attempt to make a rape joke or whatever, that's fine BUT understand that you can't have any expectation that people are going to like and accept your lazy shitty rape joke (this applies to any topic but especially if you're going to work with this kind of material) and you have to accept it might backfire and get that Netflix special cancelled, if that happens you are not a victim of society, you are a victim of YOU
(sorry, I dipped into the world of comedy writing and this subject is near and dear to my heart)
About horrible crimes when victims are around. At least that.
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