Why do people think bad of New Jersey?

I am a current resident of New Jersey, and mostly Italian-American. I used to live in Minnesota, and people think that the entire state of NJ is Seaside Heights...they fail to realize that there are dozens of Shore Towns completely different, and some alike. That is just the Shore region, there is a whole other state along with it. They don't know that it has beautiful forests and beaches, they just either think it's Seaside Heights, or Newark. I know a lot of this has to do with Jersey Shore and various other media depictions of the state. And they think it is all Italian-Americans, but in reality it's the most culturally diverse state in the country (it factually is). Why do people think that the whole state is like this just because of a few tv shows. Gov. Christie said it best "The Jersey Shore cast gives New Jersey a negative image" and "They ought to drop them off in Mauntauk and leave no bread crumbs to find their way back" The worst thing is that most of these people that are in these shows are New Yorkers.