The real problem with low elo players.
They use chat ALOT for NON SENSE instead of trying to focus on the game and win it. a guy spends 70% of the match writing long texts of non sense every 10 seconds or so , alot of people spend alot of game time arguing with another toxic player from the ennemy team , isn't that a big waste of time he could be farming or poking or getting turret or granting vision but nah he just gonna stand afk for 10 seconds writing non sense to the other idiot doesn't that put his team in a disadvantage ? He's basically doing nothing for X amount of time which is bad actually. i'd barely use the chat in my games , last ranked i was doing poorly yeah we all do that, but i didn't say anything i didn't blame or anything like that maybe the only thing i said was '' sorry guys im doing bad '' But i was using pings alot don't expect me to not use such an important communicating tool in league.
EDIT : Muting never solves this , either you tell them that you are going to mute them or not that won't stop them from writing non sense .