Wasim is pretty nice. Then again, depends on how you meet them. I was introduced to him by a Brigadier in PCB head offices a few years ago, when he was the Captain. He sat down with us and recounted some of the jokes and anecdotes on tours. He is a talker. He was a bit surprised that none of us was interested in his autograph, as he actually asked "do any of you need any autographs or something?" And we were like, "Nah! thats ok". :)
It depends on in what situation you meet them, if there are hundreds of fans gathering around the batsman and suffocating the player sure he will act badly, even I would do some gaali galoch.
Like Faisal said, he met him one on one and he was a calm guy.