"She is stunned at the outcry"....the inmates are running the asylum.
Actually, she wasn't "stunned" at the outcry. She knew the intent of the "artwork" and presumed that it was OK to taunt and degrade men in such a manner. This is the whole idea that has to be rooted out and destroyed. Men should not simply allow instnace after instance of the attack against the meaning of masculinity.
It is a general point in the "cultural war". Men feel belittled by having to "make something" out of such apparently trivial mischief. The sudden explosion on TV etc. of slapping men's behinds or physical attacks to the crotch should not be allowed to be legitimized.