I'm smarter than you are

Payton has been a smarty pants tonight, and had to go to time out immediately after coming home because she screamed, cried, stomped her feet and threw her shoes because I wouldn't give her a treat when she had just eaten a big chocolate chip cookie in the car that she made at Miss Gail's house today. Then tonight when we were outside she was stomping around again, I told her she better cut the attitude and stop being so smart, she replies "Why Mommy? I'm smarter than you are"