Stop flaming and look in the mirror
I know this is cliche, but people still don't seem to get the message. I can't count the amount of games I've lost because someone is too busy flaming someone who lost lane to actually play the game. I just finished a game where our mid went 0/8 in lane, and our ADC went 5/0 in lane, and of course the ADC spend the whole game flaming. 10 minutes go by, the mid is playing smart and staying with the team, and the ADC has died 8 times in a row trying to 1v5 across the map from any teammates.
Everyone has games where they can't get lane or get behind, but its absolutely your choice to play like an absolute idiot because your tilted at your team, or flame and try to tilt everyone along with you.
Just /muteall and group.