The comments here are surprisingly negative about this development huh?
Sure it seems kinda cringey, but I think this is good. It gives more insight on why the hell is he nicknamed “Angry” when all he did was cry.
Personally, I like this because I have witnessed something similar to this: a guy in my school was slow and looked kinda dumb so he was picked on/bullied. Until one day he just snapped, broke two bullies’ arms, knocked out two other guys and punched some guy so hard he had to get surgery to fix his eyes socket or sth. Luckily the teachers came in time to stop him, otherwise there might be death, for real.
So yeh, the whole “so angry that the character becomes OP for a while” is totally understandable and not that cringey, don’t hate on it so much