and I think you just proved rollo's point.
You go into what you explained thinking that the girl that rollo is talking about is automatically the party girl who can be inside of a bookstore and give a good conversation. That same girl could be a bookworm who has a fun side to her and happens to go on spring break. However if you met her at Cancun, you would not think of her as the barnes and noble chick and visa versa, if you met her at barnes and noble you would not think of her asthe buck wild girl with the big tit's at cancun.
On a broader scale, I think you look for what you want to find, if that makes sense, to some extent. If you look at the girl in barnes and noble, and you are barnes in noble and talking to this chick, your mindset is already going to be thinking "she is mature" so you will in your mind, point out mature aspects to her to validate what you are already thinking. NO one goes to barnes and noble and is talking to a woman thinking "damn, I wonder if she will lick whip cream off of another woman's tits".. You go in, you look for chic, you find chic. You are there looking for a certain "type" of woman and you find it becuase that's what you are looking for.
what I am saying, is I don't think there IS A SUCH THING as a sterotypical 'spring break girl' AND I think that is what Rollo T is trying to convey. There is no such thing as the typical immature girl.. well there is the typical *****, the typical slut, but everyone has some form of immaturity to them and alot of it has to do with her interest level in you, which doesn't get talked about.
The woman who doesn't call you back, who talks on the phone on dates, who has all her "guy friends" isn't as immature as you might think. She just doesn't like you. she is "immature" becuase you aren't worth her being mature. at least in her eyes.