Permanently banned

I played this game for many years,I played with different kinds of teammates.Some of them ints , some of them blame junglers. But I faced 1 people who did them all. I said some bad words to him , and I got banned permanently. I am just confusing that you people do not care about inting ,ruining others games.But you care some words and permanently banned. I was trying my best and he was inting the game and I got banned forever.He can still ruin others ' games. I just don't understand.{{summoner:3}} After I got banned, i didn't even receive an E-mail from riot game to tell me what happened and why. I just need a reason.
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