I don't know how to defuse situations where my teammate is angry at me.

I play League passively, and tend not to get too concerned over my in-game performance unless I'm having fun. This is one of the reasons why I don't play ranked, so as not to damage other's standings. While I try my best, I like to call myself the "Eternal Noob" because no matter how much I read, or scour boards, I don't seem to improve at a rate above glacial. I've met some really nice people in game, but I've also met some who get extremely worked up over their teammates performance, and nothing I say seems to help. Then I end up freaking out more, and the experience is terrible for everyone. I don't want to stop playing the game, but I also don't want to get yelled at or make other people upset. Is there anything I can do to cool down situations like these?
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