Because I live like fifteen minutes away? I literally take the train from the South Shore to Boston every morning and yet people act like I told them I just flew in from Idaho.

Exactly. It's like if I took VTA Light Rail from Campbell [where I currently live] to San Jose, which is comparable to your commute in terms of time, only to have people look down their nose at me. Fortunately, instead, I often receive "Oh Campbell yeah, I like that town" or similar.

The big thing is that the South Shore is more blue-collar and suburban (and I suppose in general more politically conservative) than the North Shore or Metro West area so they think of it as full of hicks.