Obama-Burn: We Love Your President

Incase you haven't figured it out yet, I'm not an American and I don't live there. This little fact means that I am on the outside looking in and the view of America I get is very different to that of a local. One thing I don't understand is how Americans don't like their own President? I mean you guys voted for him, at least the majority of you did. How can a guy who can deliver a burn like this to comedian Jay Leno, who is sitting just a few feet away might I add get such bad approval ratings especially after the last joker you guys had in the top job?