Why Are People So Abusive

It seems I can't play a game now where people aren't abusive and acting like keyboard gangsters. For example, just played an ARAM, lost the game and the Jhin on the opposite team says "izi". What's that all about? Why can't people just play a game and leave it at that? It pisses me off. Makes me want to punch the kid to be honest. It's so annoying.
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