Chapter 17: what is ironic about Scout's observation of the "little man on the witness stand"?

Bob Ewell is enjoying his "fifteen minutes of fame." He is on the witness stand trying to make a scene and entertain the jury with his ignorance. Scout observes that he is a little man physically, emotionally, and psychologically. He is of no consequence to anyone in town but, because of his hateful bigotry, has a few minutes of notoriety.