Can anyone explain this?

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I just had a game with the most toxic player i have ever met. He was raging from minute 1, blaming and cursing everyone. At some point, i asked him about his rank and he instantly replied "Silver". He ended the 30+ min game with 100 cs as Miss Fortune, and i could not believe he was speaking the truth. But look at this. 1 win out of 10 games and he got Silver? Is that even possible? If the system rewards people for losing 9 out of their 10 games, won't this add more toxicity to the game? How will anyone convince this person not to blame others, but instead focus on himself?
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