The fact they they honestly can't/won't hear how stupid it makes them sound only compounds the problem. They, like, wanna be, all, like taken seriously? in the real world. And, like, when they, you know, aren't taken seriously and all that they take up the banner of feminism because they are too foolish to see that it is their own behavior that is holding them back - not men, not the world, not the oppressive patriarchical corporate system, not George Bush.
For great fun, try parroting the "like, you knows, I was all, you knows" back at them. You can even embellish it with some eye-rolling and sneering. When they react, explain that it sounds awful when an adult talks like that, and that if they ever want to be taken seriously as a young adult they should STOP IT!
< /soapbox >
You know the sentence construction I'm referring to.
She finally ran out of breath after having said "Then he was like, it's OK with me."
So I asked her, "Well what were you like?"
She stared at me in stunned disbelief.