Dang it, ever since I saw your genderbent versions I can't help but picture them when I listen to This or his other Frozen songs. Wish I was good enough to do an animated version with his voice and your art @_@ Keep it up! I'm totally watching your tumblr now for the awesome stuff that doesn't make it over here.
Gender norms, imho. Guys are 'expected' to be aggressive and harsh, while girls are 'expected' to be gentle and soft. It never occurs to anyone that a girl could possibly be evil or manipulative--even though everybody goes to high school and watches shows like Scorned. And guys are constantly scolded by society for showing a soft, kind side.