No, not all southern women focus on getting married right out of college and being in the "right" sorority, but there are quite a few who do. I grew up in Auburn and still live in Alabama and some of the things you hear and see really would make you shake your head in disbelief. It was honestly culture shock going to Florida State because the lifestyles are so different there (even Greek life).
I really think it all depends on your upbringing and what "priorities" your parents feel are important (in the social system). Some families just live this life focused on society and don't know how to think any differently. In my opinion only those in the "inner circle" of society are interested in the minute details which other people might dismiss as inane. There is ettiquette and good taste and then there is
ettiquette ---taken to a whole new level. Of course, I am from the south so maybe even my view is a little skewed
(Sorry if this doesn't make sense, I'm still not totally awake yet
)