Where did girls come up with this?

This has got to be the dumbest sh*t I've ever heard. "A girl knows whether she likes a guy within the first 5 minutes of talking to him" is that not the most immature, ignorant and stereotypical thing ever? I fully understand girls don't understand why or how they are, nor do they know what they precisely want. I think girls subconsciously like being single and having things to b*tch about. Anyone. Anyone. Oh anyone at all!!!