He says directly "I am just quoting Rahm Emanuel"...He agrees with Emanuel saying they are retards. I don't see anywhere that he is attempting to do an imitation of Rahm. He is simply agreeing that the folks are retards.
At that point he makes it clear he is using his own words against him/them... Which is a form of parody. Again, not my favorite form, but it is a form of parody.