He didn't destroy anything.
He had a little tantrum in his room, where he ought to be able to have a little tantrum. Then he pulled himself together and left the room.
If he had been a girl, there would have been a lot more drama, vile things said about mom on Facebook, and a day-long sulk. That was actually pretty clean.
The jackass here is the brother. He has completely violated his brother's privacy.
Show me a teenager who hasn't said "I hate my life", and I'll show you a candidate for sainthood. Or the looney bin.