Why do celebrities get made when Eminem makes fun of them?

Eminem makes fun of everyone, it's apart of his thing. Half of the time he's not too be taken seriously, like the Jessica Simpson spoof if "We Made You". It was obvious satire to "Jessica Simpson Is Fat" scandal, but people took at as a real insult. As for Michael Jackson back in the early 2000s, he even admitted it was a joke and that he loved Michael's music. Michael was cool with it, but thought it was lame and immature. All these people he's mocked always seem to get their feelings hurt because Eminem said something. It's like they're all begging for his approval like he's God, and when he says something cheeky, they get riled up. Just because Eminem is a celebrity like them, doesn't mean he has to be nice or like every celebrity. I don't see why Eminem can't joke about those people, but comedians like Chelsea Handler can. If Eminem makes fun of someone, chances are you're famous and important enough for him to do so.