Please mind your behavior..

I'm Diamond 5. I just lost a game because all 4 of my teammates spent the entire game raging and cussing at each other. They would die typing, fail to communicate any plan, feed, and make 0 plays as a consequence.

Please understand that we are all members of the same community - LoL players. If somebody is playing poorly, cursing at them does NOT provide any benefit to your victory. Do you want a victory? Why else would you be playing in ranked, and how are you in diamond if you resort to blindly harassing one another? If somebody is playing poorly, is it better to ask them to play better, or simply cuss at them and insult their very existence?

If you're being harassed, ask them to stop, and if they refuse to, DON'T RAGE BACK! It just distracts your entire team who are most likely trying to focus on the victory rather than a meaningless scuttle about that farm somebody missed up top or the failed QSS active. If you're being harassed, USE YOUR IGNORE LIST ON THE PERSON! If your entire team are raging one another, TRY TO MAKE THEM STOP, TRY TO CALM THEM DOWN! There is absolutely NO WAY YOU WILL WIN if you spend the entire game flaming. It's seriously, less nervewracking for you to just take a 5 minute break from the game, yes, go AFK. For FIVE MINUTES! Take a breather, and return to a game that you have been at a disadvantage in anyways.

You'll probably all live longer if you behave properly and don't go crybaby 8-year old mode on your teammates. One thing you should ask yourself when you're being unpleasant is, "Is what I'm doing really necessary?", or, "What age group would my behavior generally be considered to represent?" If a naiive toddler is the answer to that then you can CHANGE YOUR BEHAVIOR IMMEDIATELY! Take ONE DEEP BREATH! CLOSE YOUR EYES FOR A FEW SECONDS! Calm yourself down.

Tl;dr: It's pointless to rage. If you don't want to play, then simply dodge or AFK and come back when you do. Go outside. You'll live a longer life if you condone a less stressful atmosphere around yourself. Live longer, be happier, and promote a better community.