Okay Girls give me a little Feed back

Okay ladies, As a single father with 2 girls I can already tell I am in deep Dodo... The other day I was doing the "Dad is right" Argument with my 11 year old. I ended up with the vein on my forehead throbbing and saying, "You are not a teenager yet, why do you have the attitude already." Now here I am getting a little angry with my 11 year old Daughter. She says, "Dad I am a Girl, its called PMS" Okay I know a little about women, but what I want to know is: 1. When they seperate the boys and girls for health class do they actually say, "Now if a man gets on your nerves, Treat him like crap and say it is PMS." 2. I looked under the Sink where all the Feminine Products are to see if she has needed them yet, boxes are all closed still. Can she legally use this excuse before she starts getting that monthly visit? And just to finish the story... After she said that I had to leave the room because I was laughing so much...