The larger culture in Boston is a lot more "who you know" / "where did you go to school" than in California. Basically if you didn't go to an Ivy League school then you're kind of in a lower social caste. You get looked down on (in a very subtile and "polite" way) if you are not Ivy League or if you are from the "flyover country."
The other (related) problem with Boston is that it's not extroverted. Boston is bookish and introverted and quiet. It's sort of impolite in Boston to have a fun personality, and it's very hard to make friends. Bostonians don't have friends, they have colleagues. (A bit of an exaggeration, but you get the idea.) Laughing, making jokes, and having any kind of personality sort of marks you as lower class.
It reminds me of a more classist version of the famed "Seattle chill":
http://seattletimes.nwsource.com/pacificnw/2005/0213/cover.h...
Basically Boston is very classist, bookish, and introverted. Boston has tons and tons of brains, but they're <sniff sniff> intellectuals, not revolutionaries or innovators.
Boston may actually have more raw IQ-power than the valley though. Put LSD in the drinking water here and you might rival the valley in a few years.
But like I said there's a bright side too. The Bostonian politeness thing is a double edged sword. On one hand it's stuffy, but on the other hand it can be quite noble. Bostonians will help you out. They will quietly come to your aid. They will close ranks to defend you if you're wronged (provided you're "in" with them), and they will quietly and gradually mentor you. You can drop your wallet in downtown Boston (population almost 1 million) and someone will drive to your house to bring you your wallet with everything still in it. (This has happened to me, and to two people I know.)
So the upside is that Boston is very civilized in a positive way, but the downside is that it's very "civilized" in a negative way. Oh, and you don't have to own a car. Having to sit in a dinosaur burner huffing fumes for three hours every day is one of my least favorite things about California.