<human>: I have friend. This friend is kind of an asshole to everyone except me. He is rude to everyone besides me, and will intentionally start arguments about petty subjects to prove his intelligence, and doesn't know when to stop. When people get mad at him for it and start giving him what they've been receiving, he'll whine and complain. His victim complex is through the roof and it's infuriating. He never accepts responsibility for what he's done, and always blames his mistakes on somebody else. I have never heard him say sorry to a person besides me in a non-condescending or sarcastic manner.  

Now obviously, somebody like this has a hard time making friends. That's why I still hang out with him. When we're just hanging out with each other, he's fine. He's funny and quiet, which I consider awesome qualities in a friend. I really enjoy being with him alone, because he's incredibly chill when it's just us.

 But in public he's like a different person. His jokes turn in to making fun of other people, sometimes directly to their face, and I have to de-escalate the situation by laughing to convince the other person that he's making a joke. To be honest, I feel like if I wasn't there somebody would get fed up and hurt him. 

He really doesn't have any other friends. I don't want him to be alone. I make sure he's always included in everything I do with my friends, but now he's started being rude to them too. 

I'm afraid to say anything to him because I'm afraid that he'll pull his victim card out and start telling people I'm an asshole. He's started to be rude to my other friends, and I have to laugh at his jokes about other people in order to keep situations civil. I don't know how to tell him that he just needs to chill out without him getting offended.

Can you give me a shortened version of the text?
<bot>: Friend with victim complex is rude to everyone except me and I don't know how to tell him to "chill out" because I don't want him to think his only friend dislikes him.