What I've learned playing league
Getting upset isn't allowed no matter what happens to you. You're unable to get upset at anything. Team purposefully trolling when they're not in a full 5 man group? Can't prove they are so they're free to go. Teammates punishing each other over petty things? Nah just a new strategy there's no reason to be mad, and if you do get mad you're reported. And you can say things like "Hey we can't understand you we need some communication." or something similar that's a bad report. If you get flamed and reason back against said flame that's also a bad report. Riot doesn't like you getting upset they like you to think of everything at a emotionless thing because the game isn't fun its just a system meant to be addicting which is why people still play it 90% of the time. They don't enjoy it but it gets their dopamine flowing when they're doing good, but not enough to bring actual joy. They want to keep people in that grey little area of emotionless cycling to make sure when they release a new flashy skin that's what you see and end up buying.