It is wrong to verbally abuse people.
Chris and Tom are talking about sports when Tom says that Jim Kelly was the best quarterback of all time.
Chris wants to tell Tom that he's incorrect.
Chris tells Tom that judging by the stats that there were better QB's throughout history.
Chris tells Tom that he's an idiot for thinking that and that it's not even close to the correct opinion.
Tom becomes interested at looking up those facts and thanks Chris for showing him evidence to correct his thinking.
Tom is annoyed at being called an idiot and thinks that Chris is kind of a maniac.