Interesting reply, it seems you've misconstrued the intent of my post.
I was merely sharing my observation that certain areas in the South Bay tend to have more stuff to do (i.e. a downtown). Not sure why you took that as me denigrating parents and families. Perhaps I was being vague.
I agree that culture is something, as you put it, that is kept inside of us. However, people don't exist in a vaccum. We are very much influenced by the environment we live in. Most people don't exist in a cultural vacuum where they don't interact with the larger cultural forces in their environment.
My (admittedly anecdotal) experience has been that the South Bay is primarily a work culture. Having lived both in SF and the South Bay, I can tell you that both are offering very different answers for the same question, regardless of whether or not you are single, married, or have kids.