I wonder how much of this "I don't trust girls" sentiment is the result of girls having higher expectations for female behavior & female friendship.

So when they realize that girls can be just as crappy, untrustworthy, & hurtful as boys - because girls are just people, not sweet & angelic exemplars of moral rectitude - it seems like more of a betrayal. Because boys are just being boys, but girls should be "better" than that.