Considering his poignant pauses and he makes these gestures, I see it as sarcastic comments made with the gesture as a direct insult to the person he is talking about. Additionally, the response he gets from the crowd makes it obvious that they KNOW what he is doing and saying and are enjoying it and he laughs in response (during the Hilary one) to their response. I think it's rather obvious, but I didn't drink the kool-aid either.