Not when he's representing this country, as he was at that funeral.
He can "be himself" while on vacation or golfing (which he tends to do both a lot), the American people expect more dignity and decorum from their President, which is why there is such a shit storm brewing over his antics.
He of all people should know his actions would be under scrutiny during this funeral, it's as bad as Bill Clinton caught on laughing and joking around after Ron Brown's funeral, then putting on an act once he realizes he's on camera!
Sorry, disagree. It only demonstrates that his only focus is on himself, even when others are suppose to be the center of attention.