I have two guesses about Nancy Grace:
1.) Her personality on her show is an act of sorts. She deliberately goes over the top in attitude toward her guests, and they're well aware it's going to happen. I can't see professionals -- psychologists, lawyers, forensics experts, etc. -- being talked to so rudely and sometimes with such immaturity without flinching, unless they're forewarned about the act. The reason for the act would be to have an edge in the overcrowded industry of broadcast media. (This wouldn't mean that she doesn't care about crime victims, because it's obvious that she does.) If it's not an act, how could the guests not have a look of wonderment much of the time?
2.) Nancy has a narcissistic personality and her guests are kind of incredulous at her manner, yet they walk on eggshells (as most of us do around moody, know-it-all types who can be set off on a whim and are suddenly angry and rude).
I like her, but something is up.