The reports work.
Ok so I think this is the right board. So I have had a few teammates raging at us for no reason. I remember the one guy saying oh you have 9 deaths ahahahabahaha. And him having 11 btw. But yeah I reported him and I have had 2 reports where riot said they did something. Likw I tried saying chill man just relax things happen but mod of the time they proceed to rage.