All she did was change her outfit. 

Danny saved her life from drowning, lettered in track and wore a letterman’s sweater that he EARNED WITH HIS SWEAT to win her heart! He did this while rebuilding an old car and practicing his dance moves for the dance-off with Sandy, all the while rejecting Rizzo’s advances and then getting stranded at the drive-in and branded a fool, please show this man some respect.