Hi,
Sometime, it just to not play at all. Ok, for me it's easy because I can't play a lot at all. For example, when you are on a losing streak, it's quite good to let the game behind a little while, go play others games, go outside, see friends. I don't know but just don't play league of legends. Some people in this community can be really insulting. This week someone even call me « cancer » and I am, mostly, a gentle soul. I just didn't understand that person and it really hurts my feelings.
But if you are not on a losing streak, take a deap breath even two or three. If there is someone who is insulting all the team, mute him and report him at the end of the game. (Whenever he/she is on your team or on the opposite team).
Other thing, try to think about your game. Do we need to push, do we need to defend or to take a turret, or drag ? Do we need to group and one could splitpush ? I don't know but for me thinking strategicaly works. It's like, for me, focusing on the game and not on the insults. I really like this game for the strategicaly aspect too. ^^
I know it's really difficult to being calm again when you have the worst kind of players to deal with.
I am no psychologist lol. And english is not even my first language so sorry for mistakes.
League is a good game. Hope you still find fun to play it. ^^