Filter System for in Game Chat for Verbal Abuse

During one of my recent games on league of legends I encountered a player who was a little more upset with the game than I would like to have experience with. When discussing back with him in game their is no reason behind his responses. It would just spiral into different obscenities and other profanities. Now I love league of legends and the fact that these kinds of players exist makes it harder to enjoy the game. One thing that I think I would be able to see a change in, would be a filter system for in game chats. How I could see it working would possible be some trigger words that could relate to: excessive swearing, insulting comments, and/or profanities/racism would put the game under an automatic review for the player. This idea could be far fetched, but if in the long runs, it could lead to a better league community and punishing those who have a bad behavior and show disrespect for others. If you see anything in this post, that could lead to more problems, or something that help it move along, speak up!!

Thanks for reading!

Edit Based on some of the comments below, a certain list can be compromised for some of the issues this would face. As in 5 man premades, the filter system would be shut down for the sake of inside jokes for a possible perceived problem, otherwise a small basis of obscenities would be the key commented feature for the punishment to take place. Even then if it is still causing trouble it could not just flat out punish the player but instead act as a player hitting the report button at the end of the game to send the game under review for that player.