Toxicity doesn't lose games, bad players do.
Always remember that before blaming your "toxic" teammate for losing the game, if he's topfragging and trying to carry you, you are losing the game because you are trash.
inb4 "but toxicity makes teammates play worse" - if your aim is ♥♥♥♥ and you can't hold your site/can't get an entry, a teammate pointing out your mistakes isn't the reason you're bad.