Here's what you do to stop a raging team
When your team starts ganging up on someone (it can't be you for this to work) for playing poorly, and its getting to the point that the raging is causing your team to make mistakes, all you have to do is say "ez is my gf irl. plz be nice to her" and nothing else, and it instantly makes them stop talking.
No one wants to look like a jackass in front of a gamer chick, and the guy who was getting ganged up on will thank you for making the team shut up and play. It also makes the guy who is feeding try harder because he knows you just stood up for him, in a way.
Enjoy.