He has a growth disorder, I forget the name of it. It's pretty well known though, hes been interviewed a lot and was on the Jimmy Kimel show talking about it before. He's not a kid, hes about 29 I think, which makes him almost 30.
He's also pretty smart, since he took advantage of his medical problem to propel him into stardom.
And you might have heard of his videos before if you pay attention to internet memes. His most famous one was "The Super Bowl is Gay".
Also, you dont need to have such a bad attitude. It's not my fault you reprimanded someone for not knowing how to spell his name and then it turned you didnt either