Just had the worst game of my life

I was just in a game, we were winning at first. everything was going well. then one small toxic comment happened. Our person took it way to harsh, and then intentionally fed the enemy team 16 kills. We had a zed mid doing great, and she started to insult him, started to insult me, started to insult jungler, said what we were planning, she told which people to kill her. The enemy did, of course, i can't blame them for taking a free win in ranked, but this has gone too far. Riot, if you don't stop this BS and look at reports seriously, I am leaving this game.