Your teammates fucks up; What do you do?

You shut the hell up or give ACTUAL constructive criticism instead of just being a raging douche. There is absolutely no reason to rage at your team mate when he messes up.

1: It doesn't help you whatsoever 2: You're probably going to make him play worse. 3: You're tilting the rest of your team. 4: You're probably tilting yourself because your busy raging in chat when you should be focused on the game.

Don't rage at your teammates, all it does it tilt them and everyone else on the team, DRASTICALLY (By like 17%) lowering your chances to win.