Meghan McCain, the blond daughter of Sen. John and Cindy McCain, perpetuated female stereotypes yesterday when she tweeted about trying in vain to unclog her bathtub drain. “I just put a half a bottle of Drano down it and the Drano is foaming and not going down . . . I am unclear about how to use Drano. I can’t even begin to think about snaking something or plunging. I think I may have messed up my bath.” Commenters went to town on the damsel in distress.