Zero learned that from another zero ...
I find it very telling by the way he looks at Clinton, forces a big smile, and then it disappears instantaneously when he looks away. Obama is an empty suit and a very empty man-child.
Did you notice right after the big grin and slap on the back, the grin immediately disappeared as he turned away? Yep, you’re right—an empty suit.
I would imagine he was furious and wishing he never invited Clinton to the White House for whatever it was they really talked about. And Clinton- he probably loved every minute!