What else can I do to stop my teammates from flaming

Hello, Before I start off with my "rant" (basically, I'm just begging for advice), let me say that I am by no means perfect when it comes to my gameplay. Hell, why else would I be stuck in silver then? Obviously mechanically I'm nothing special, even though there are multiple factors, but whatever. I'm having a really hard time trying to stop my team from flaming, tilting etc. Last game I was just desperate trying to stop my team from flaming. 20 seconds in, this Thresh goes: "Look at Lux match history, she's fucking bad! Won 4 of her last 20 matches!". So I ask him: "Would you please stop flaming Lux? Let's make her win her 5th game then." Obviously, that didn't quite work out the way it was supposed to. Not only did Thresh continue to flame, other teammates (including a lovely premade) joined Thresh in the flame fest. Again, I keep telling them; The flaming is not going to make her play better and you are going to make her tilt like this, please stop. Now we're at the point of me being reported for "sticking up for my retard premade". Lux wasn't my premade, but showing decent behavior towards another human being, clearly means you are premade. Now again, this doesn't happen every match. There are more than enough matches where it doesn't happen. I don't always win them, but at least the attitude is positive, which at least gives you a higher chance of winning. I'm just trying to sort out what else I can do to stop my team from flaming? Should I just accept they are a lost cause and let a teammate get all the flame for no good reason? I'm getting to the point where I am just tilted because of all the flame going on. I know I can mute them all, but that doesn't stop the flaming towards other teammembers, who in return start playing worse. Please, just please tell me what I can do to make it better for my team.
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