Stop bickering and play the game

Some people have this unrealistic expectation that everyone on their team is a professional player who can make no mistakes or build exactly how they expect they should build. They end up spending more time in game flaming others about how badly they play than actually playing the game.

All the time people spend putting others down could have been spent farming, getting objectives, or picking off enemy players to turn the game around.

Reality checks:

1. Almost everyone, including you, are not professional players
2. Even professional players make mistakes, but they know the importance of farm and objectives to turn games around
3. Not all of your shot calls and build paths are amazing and endorsed by Faker's holy touch
4. People play a lot worse and throw games when they get harassed
5. KDAs are not the only winning factor in a game, you can be a 0/100 rammus and still win because you took down turrets and won one team fight

You are always going to be paired up with a lot of strangers in your games, but the bottom line is you are stuck with yourself in each and every game. So instead of focusing on what your team does wrong, focus on what you can do to improve because at the end of the day you are in charge of yourself. If you have a high blood pressure problem from raging on random strangers on a multiplayer game, then perhaps this game isn't right for you.

Only two things get accomplished from raging: you tilt your OWN TEAM into playing worse and you end up getting punished and ultimately banned from league of legends.

Ask yourself is it worth throwing away those potentially thousands of dollars and hours into this game just to put someone in their place that you have to play with for just 20-40 minutes?

What I do when I see someone flamming? I give it one attempt to tell them to stop raging and then after that I mute them, and sometimes I just skip straight to the muting because then I wont end up investing so much time and effort dealing with a raging person and instead focus on myself.