The way she did it showed him it's okay to lose control in the way she doesn't want him to if it's for HER reasons. Being a chubby kid, I'd wonder if he's getting bullied himself at school and is taking his frustrations out on his family. Thinking any "ratting" he does will only put on him the kind of backlash that REALLY matters at that age... his peers. As parents, we need to see the whole picture. Even if we think we have a good handle on that, it might not be the case.
Taking away the distractions was good, but rather than destroying them which just says violence is justifiable if the bigger, stronger person does it... I made my own children clear out their rooms down to bare essentials and put their stuff in bags to be given away. Only had to do that once.