I can't stand when your team is doing well, and then they start fighting over something as simplistic as a minion being killed by someone else. And after they stopped fighting one of them leave, like what just happend to me, and lose the game for the ENTIRE team.
It pisses me off, that people that afk or just give up completely, are able to even play this game. I've been stuck in the same Elo because of many situations exactly like this.
And feel free to report: <*removed by moderation*> for this exact reason.