acknowledging that your jokes are tacky and politically incorrect does not make it okay to tell them, because while you are telling the world that it’s not okay to tell those jokes, you are telling them yourself, and you know what that makes you? A big, bloody, incredibly rude, politically incorrect hypocrite.
Think of it like this: if somebody decided to tell a rape joke, preceding it with “I know it’s not okay to tell rape jokes or whatever, but it’s funny so I’m gonna tell it anyway,” would it make it okay to tell the rape joke? NO. Would it make the rape joke funny, or funnier? NO. So why would you do exactly the same thing at the Oscars, of all places?