Experience

Recently I was talking to my friend about northerners. He told me how they were unfriendly, intolerant and such. I asked him why he thought this way. He said that that most of the ones that he has met were like that. I tried to explain to him that he couldn't generalize an entire people. But he kept on with "There are some exceptions, but I've rarely met a nice northerner." I see this fallacy all the time. People basing their evidence on their narrow experience. But it isn't the way to win arguments, only lose them.