PSA: Sometimes people have bad games/matchups
So stop getting so bent out of shape over it. They're having a bad game not punching your cat. Sometimes people can't "just farm under the F-ing turret" with a Zac jungler who can soak up turret damage while an assassin deletes you, or a ranged vs melee matchup, or an unfortunate successful gank on a lane that puts them behind.
Tldr- People have bad games, that includes you, so next time you wanna blame a teammate just take a sec to remember your last bad game, I doubt you'll have to think back too far.