My take is that LeBronda is not in the wrong here, based on both angles.
Kid came up, camera on, or about to be, with a forearm as though he's gonna sneak in for a picture and didn't even ask LeBron if he could. Not cool to do to someone who needs to roll with security.
LeBronda rightfully said not to do that. And that's all he did to the kid. Someone has to say it. At least it was LeBronda and not a security guard, then we would be bitching about how LeBronda sicked a security guard on him, lol.
Poor kid got a bad experience, that's too bad, but he should have asked instead trying to just take.
Or, LeBronda could have stopped for a picture, but the kid wouldn't have learned. Both sides could have done better, I suppose.