Whatever. The guy seems like a pain in the ass. It’s a rookie-ish mistake that he didn’t just pose and send him on his way before it turned into all this, but there appears to be more here than is captured by the clip: Note that Obama recognizes him and asks him to lay off even at the very beginning. How long was he hounding him, I wonder?
Some of the exchange is hard to make out but Ben Smith has a transcript.
Update: A good point from the comments. How did the Secret Service let this guy get this close?