I'm a person who loves to joke just about anything/everything WITH THAT BEING SAID...
I don't believe racism, sexism, homophobia, etc are things we should be ignoring or "getting over." Once these things don't have serious effects on our society (and if you don't think they are alive & well, then good for you for keeping your head up your ass) THEN, maybe.
Until then, they're not always just jokes, especially if it's coming from a form of media. They're real to a lot of people, and whether you can relate or understand is not the point. People of privilege don't get to tell oppressed people what is or what isn't offensive. That's not how the game works. You have no credentials that give you the understanding.
The trick of "speaking ON the stereotype" is that we don't live in a world where that is clear. There are so many people who see stereotypes and racist portrayals of people in media and go, "ahahahaha, oh my god, that's so true!", make similar jokes in real life, and so it continues.
Who the hell is a white person (and I'm a white guy, so don't act like I'm seeing it from a different angle) that they feel they have enough understanding or right to tell someone to "get over it"? You don't have the hurdles/issues/prejudice/harassment/etc these people do. That's incredibly ignorant.
I am big. It’s the REVIVALS that got small.