I don't have much respect for something that just tries to be offensive. Because what's the point?
That being said, you should be able to joke about anything, but when you're just being a bigot or a jerk, you deserve to be called out on it.
What is offensive also depends on the person and the context, so it's not like there a well-defined genre of 'offensive humor'.
rbstewart7263 said:
(like racist jokes under the understanding that you are not racist and such things are not ok in real life.)
Here's the thing, though. Can you be sure your audience understands that?
The jokes I tell amongst good friends are very different from jokes I'd tell on the Internet for example. Because my friends understand the context and for example that the joke is on the stereotypes or that I'm expressing frustration with an actual issue I have.
Without knowing that stuff it would easily be misinterpreted as ableist, or misogynistic, or homophobic, or misandrist or just horribly insensitive.