I think that goes both ways there are girls who do this about guys in fact lets open it out there are some who do it about others whether it is opposite gender or their own gender. I agree totally with your premise that social interaction can not be broken down into neat stereotypes and equations. A person who stands up and believes they understand all people or even a group of people is a fool becoming a bigger fool if they expound out loud this theory. The world is 7 billion plus individuals with different mindsets not a standard array of groups that fit neatly into 20 pigeon holes (can anyone say stereotypes).
I'd agree with everyone over analyze but I would not go as far as saying that we know everything about women. Were just giving our opinoin on questions. Were not trying to state it like our answers are facts.
I always ask why I over analyse things. In terms of women, it's because a lot of men look at those guys who are successful with women and wonder "how the hell they do it". I'm constantly out and watching behaviour, reading between the lines, looking at physical looks, speech, etc. we just looking for that which we don't understand I suppose.