It may not have anything to do with what is being said; but, more about having the finger in his face. Do you like that? Does anybody?
Yes, he looks like he is forming a fist with his right hand.
Shaking a finger in someone’s face is a sign of dominance and control. Bam is an egomaniac with an inferiority complex so it makes sense....
But we must remember that this is not the headmaster of Sidwell Friends whom he is trying to humiliate.(which would be bad enough) It is the Canadian Prime Minister: a world leader! Unbelievable. This man does not represent ME!