4-Man Premades Can Be Bullies And Cowards
I have never run into a 4-man that didn't flame either me or the enemy team. Solo queuers in Draft and Blind Pick need an option to disable that possibility.
Having someone feed a lane/steal a lane or role/steal the ADC's CS/ and never communicate and then flame in both team and all chat is exhausting.
Having a 4-man pubstomping the enemy and lose the game while trolling in chat is worse. They will always, always blame the one not in their group, regardless of how well they're doing.
Getting "reported" by 4 people and not knowing if they were still trolling is excruciating. And it could lead to a needless ban if they follow up on it.
They're need to be dealt with, they can really ruin the experience.