It was like a kindergarden game with 7 kids all screaming mom jokes, saying "STFU YOU BITCH F***" to eachother all game.
Riot needs to address this issue, they tried getting me involved and I just ignored it all
You've been on this forum enough to know Riot is 
toxic players early and often.
That's kind of funny actually. Kind of jealous. I got a game of a trashtalking the other day where my team was in fighting, calling each other the stupidest of shit like 'noob', 'baddie', and 'moron.' No swears either. Like, if you're going to trashtalk, at least do it in a manner that deserves popcorn. CoD kiddies ranting is to much fun to read. Not to listen doe. Earaches are bad.
But obviously this is an outlier or this board would have the same thread popping up everywhere for multiple days. Calling it an 'issue' is making a mountain out of a molehill. No matter how good Riot's system is, there will always be outliers like this. Just mute, report, and move on.
Cool we don't care.
