Play with chat off - play your own game. At the end of the day, you can only control yourself.
The primary reason people lose their mind in shuff is the long dps Q times. Players can’t psychologically process waiting 30 mins to lose rating, so they flame the person that has the most buttons to keep the team alive.
Look, every game is always going to have a player that’s the worst. Let them burn up and fall. Don’t stress it!