Do you find this offensive?

Ok. For a school group project we were supposed to make a themed video in spanish. Our theme was American Idol. To impersonate Paula Abdul my friend (a guy) put balloons under his shirt to look like he had a large bussom. My spanish teacher deducted 100pts out of 300pts total (thats a D+) because she said most girls would find this offensive. Would you find this offensive or funny?