I disagree.  I do think he says some stupid things at times.  And he doesn't come off pretending like he is a genius.  He makes fun of himself and his shortcomings.  

He is a comedian.  An entertainer.  Plenty of people who are comedians, like George Carlin, are just like that.  

If you gave him the choice between labeling himself a "genius" or "amateur" it is pretty safe to assume he would take the "amateur" label and tell you why he is not a genius.  He pokes fun at himself.  He is not politically correct, that is for sure.