This is the most girly thing ever. This would not happen to a teenage boy no matter how much mom sais "you are not going to school like that". A real boy would have to wait until dad comes home. But any determined grown woman can forceably shave a teenage pooner.
My gran forcibly shaved, well cut off one side of, my granddads moustache. They were in Egypt during WWII not doing much fighting at the time so he and his colleagues were in this moustache competition. He had one half that made a perfect curled moustache, the other just drooped. My gran cut the droopy half while he was asleep. It was always remembered as a hilarious thing that happened while they were bored on assignment, cos it didn't threaten my granddad's masculinity.
One could say, my granddad took it like a man. And big up my gran, she was awesome and is much missed.