Eye-rolling, occasional yelling and shrugging off your conversations with "whatever" is normal. When it escalates to a higher level via swearing, hatred and hostility, that's crossing a line, says Loren Buckner, a licensed clinical social worker and psychotherapist in Tampa. If your teen slams the door, for example, make sure she knows that it's not tolerated behavior. And check your own behavior, too—you have no clout if you're doing the same thing, Buckner advises.