I remember once I asked a couple of Mormon kids that came to my place to name one virtue that they as a believer had and that me as a non-believer, could not have. Kind of stumped them.
You outwitted a couple of 19 year old kids? Wow. You're awesome.
I think Trout's point was, rather than find out what people really believe and do, most folks tend to rely on stereotypes. Media and popular culture do nothing to discourage this.