I understand your anger, but don't say hateful things to others, and how do I get by with not being toxic myself, there are many things that can be seen as toxic, but many games I find myself matched with toxic multiple times a day if unlucky, I just mute everyone the first time I hear things I do not like no matter how little it maybe then I play the game not caring I don't stop trying to win but I understand there is like a 1% chance to win might as well go for it who cares attitude, but I don't show it in chat.
I am once again running into many toxic players sometimes I am lucky to get a few great games in a day for example first game of the day was great, good players all around we play great together, two games after toxics I just mute everyone did what I could two games in a row were due to champion select toxicity the reason things go bad, players don't talk even when asked what champion they are running no answer so I wait last minute before choosing they go to take my champion I am going to take with no communication then I choose one in a hurry get something not so good then they get toxic in the champion select screen im like you didn't talk, and here comes the hateful stuff (Mute everyone in game continue the game) and lose then even more toxicity at end game.
In general one reason there is so much toxicity no one takes time to think about team comp, they just lock favorite champions if players thought about skills of champions and what would win team fights more as well as actually talked in champion select when someone asks something there would be less toxicity especially during ranked, a lot of times I personally listen to blame from others for their own decisions of fail ganking, playing a certain champion because there was no communication in champion select, and I just toggle the mutes without saying hateful things I can understand when something is my fault or the fault of someone else for example it doesn't matter if I alone am doing great in my lane if the enemy team has a better comp and plays better they will be more likely to win where if your team has even a good champion who knows how to CC well and one good player mid or more than one good player you are more likely to win even if someone does a bit bad which is rare to find it seems.
I don't know really the best solution is to mute everyone, without being toxic yourself, and the most you usually get if reported by a bunch of toxic players over games by the automated system is a chat restriction, and perhaps a few ranked bans, but usually nothing extreme.