what's with this whole Townie/Yuppie thing in Somerville?

O.K. so I'm moving to somerville (davis area) from brighton and I'm totally psyched because I think brighton is really lame and somerville seems so much cooler. I was drawn to it because it seemed much different in that it was artsy, diverse, laid-back, and seemed like there are real people there v.s. brighton which is filled with a lot of the same types of people-annoying preppy college kids, and sports obsessed meathead jocks.
But all i keep hearing is this Yuppie v.s. Townie thing going on in somerville. The Townies are moving out the Yuppies are moving in bla bla bla. So basically that means if you are moving into somerville you are a Yuppie? Well I am far from a Yuppie and I'm sure as hell not a Townie! I grew up in the city. (not around here)
I don't get it where I come from you are either from the city (or suburb) or from out in the "sticks".

Townies were people from small towns in the "sticks" that were small-minded, ignorant simple people that didn't live in the city and were scared of city people and usually didn't like them. They weren't exposed to much except for there own local stuff that they knew. They often were white-trashy and and bigots.

Yuppies were basically preppy snooty white people with money who thought they were better than everyone and wore a lot of khaki dockers and collared shirts. They usually lived in the suburbs.

So why does it seem that you are either a Yuppie or a Townie if you're in somerville? I despise both and I am definitely not either. So what does that make me? Last time I checked somerville is a city right?

Please hhhhhelp!!! Those who are from or know somerville shed some light on this for me!!