Notice how Hillary looks like a bobblehead figure as she nods incessantly while the black guy babbles on? She’s not listening to a word. She is trying to assess whether her memorized rhetoric is going to satisfy the blathering idiot who keeps droning on and on. (She is probably late to another appointment).
Hillary does the bobble head doll movement all the time. Its one of her annoying mannerisms. It adds to the perception that she is a robot.