Honestly You have to play through it. Sometimes when you're team is bad, you just got to mellow out and keep playing regardless of a win or loss. Who knows someone on your team could be new at a character, wrong character, bad at their role, or etc. Even if they are trolls all you get is mad, and that's what they want. Not only that but if they're good they can report you for how you react and make it look legit. The tribunal has no idea if anivia walled you off so that you died. All they can see is the chat and stats.
Furthermore posts like this don't make you look better, and only receive you down votes. Mostly negative review as it appears you came to the forums to flame instead of trying to reach a reasonable conversation with others in the community. As other threads are doing already in attempt to prevent toxicity.