Ie: Don't blame selfishness and the 'me me me' red-herring.
It's more the inability of parent to teach their children better than they themselves were taught..that's what pervasive attitudes are all about.
If you, as a parent, are biased...your children will be as well because they'll suck up your attitude as the norm. Once they reach a certain age, they're take their attitudes from their peers as much or often more than from their parents (not from lack of effort on the parent's part, but that's just how kids are wired - seeking independence first from their parents, then from their peer-group) *See rebellious behavior*
Eventually they'll become their own person made up of some of what their parent taught them, some of what they learned from school and their peers and a great deal from their own personal experiences.
These girls are at the stage where their peers have a larger impact on their lives than their parents do. Parents can try all they might, but it often goes in one ear and out the other....
All we can do as parents is to keep plugging away and hope some of it sticks.