Bullying is the biggest problem in this game at the moment

My chat logs, with context from my memory.

Enjoy ripping me apart emotionally for getting reduced from honor level 4 to honor level 1. I bet these guys if they come to read this would be ecstatic to know that they got me banned.

[our jungler declares she doesn't know how to jungle, so I respond:] smite gromp [we get both enemies to almost dead, instead of killing off the high damage jhin, so I warn vayne:] you were supposed to kill jhin when you had the chance not poke the damn tank [vayne lets leona get away when she would have died for sure and then doesn't threaten a returning to lane jhin in the slightest, allowing me to die for free, so I get upset with her for good reason:] why don't you condemn him you mean you used it on leona? is that why she escaped? i said HIM oh nevermind you mean the wall my bad well i still think it's dumb you backed off immediately [i tell her my new play of trying to 'support' her:] from now on i'm doing NOTHING but protect you because i can't trust you to protect me [lux/quinn starts unloading on me with their rage:] if i was salty wouldn't i disconnect get real [vayne starts acting like i was the one being aggressive even though she used her condemn offensively so i ask her to stop being toxic:] vayne if you tell me something rude like that again i'm muting youi [she continues to be rude, acting like she did nothing wrong in either the game or in chat so i tell her i'm abandoning her:] you inted me into the enemy and told me not to be aggressive you can lane by youtself now [lux comes to top because i have no idea, just to kill time i guess and quinn complains that too many people are in her lane so i tell lux that i can help quinn solo, after all she had been complaining about nasus anyway:] lux it's cool i got this [quinn starts flaming the hell out of me trying to get me to leave the lane, where else would i even go? lux had already been flaming me harder than she was and vayne was not an option either:] unless you int me into their team hanging with you is a million times better than with vayne so shove it [she feeds me into the enemy nasus just because she doesn't want to 2vs2 the enemy jungler so then i complain:] if you right clicked him one more time instead of running away i would have killed him actually did you even right click him once??? [enemy starts flaming me so i respond:] telling her that nasus was an easy kill but she chose to let him go isn't raging [lux keeps on flaming me, i probably should've muted her ages ago but i was hoping she'd stop being so hostile, she only got worse as the game went on though, so i probably shouldn't have shamed her here, but it was the absolute trurth:] i'm not griefing, you are empowering your bad mannered club member vayne to behave badly bullying me [lux accuses me of being 12 years old so i respond:] becoming 13 years old or greater doesn't make you immune to bullying especially not online [i finally mute her so i notify her of that:] either way you got muted after that msg [it's time to give our respect to our opponents for completely destroying her team morale so i inform the team i'll be willing to concede:] it's twenty minutes now we can end it with 80 percent majority let's do it [now our jungler makes a comment that nasus or whoever on enemy team is a problem, so i simply reply that we shouldn't be worrying about the enemy, our team is doing more damage to their chance to win than the enemy:] not as big of a problem as our vayne and quinn [despite me attempting to help 2 different lanes, we have nothing to show for it because there is no cooperation, hence i followed up with this statement in an attempt to argue for a concede, so that maybe our jungler would concur and sway the others to comply:] we don't have any towers so zero map control [jungler/quinn starts complaining about not having vision so i respond while i'm returning to an empty bottom lane:] nowhere we could put vision where we wouldn't die for it [i get to enemy tower and beholden to my teammates:] notice to team vayne never touched her tower [and the shame:] and she left the lane [jungler starts crying again because her other 3 teammates are being afk assholes as usual watching other people do all the work instead of cooperating so i respond:] don't worry about it just mindlessly click around the map it's not like these 3 are ever going to teamwork [quinn snaps and finally goes full rage mode on me and asks me to play to win mother fucker which partially is censored so i joked about the fact she was censored and responded:] no, you mean play to win another game [quinn or jungler don't remember which is whining about my earlier comment about mindlessly clicking so i respond again:] as long as you're killing stuff it doesn't matter where you go is my point [still whining so i reply again, i suppose i should have muted them already by now, oh well:] not if teammates refuse to obey common sense [quinn is flaming me pretty hard again, i don't remember her comment but it was totally unreasonable, maybe something like i should be with the treacherous team instead of split pushing, as if i could do anything but 1 vs 5 and then watch in horror as my allies wait out my assist timer again before thinking about killing anyone so of course i'm pretty angry and finally mute her:] i'm the only one that's bothered to put significant damage on a tower. you don't get to flame me quinn [i go ahead and mute our jungler finally because by now a lot of time has gone by and the game should have ended at 15 but it's like 25 minutes plus IIRC so i tell 'em i'm clocking out of team chat completely although i guess i should have done it long ago:] diana if these are your friends you're much better off solo [a few more messages to the enemy because there's no one else to talk to:] can you quit playing with my team and end it?
i know you could have by now they are never going to surrender they have too much fun flaming me while i hve them muted

We need a way to know from the start that we're with a group of players. HotS has this, and it unfortunately only shows up in the loading screen, but at least it definitely shows up at some point, so you can just screenshot each loading screen and review it while you're playing.

If we had such a system in LoL, then we'd be able to decide to do things such as: well if one player offends me and he has 2-3 buddies, I guess I'll just mute the lot of them and do everything I can to be a team player so that they don't get even more mad at me than they already are.

IME, reasoning with people is hit or miss, but chances are if one person is worth complaining about, the entire group is going to go stark raving mad if you dare to mention anything. In HotS, I can just mute the entire group of players so that I don't have to read the toxic comments in the first place, as soon as one of their kind starts intentionally throwing the game. But I can't do that in LoL, and it annoys me because it leads to situations like this where I got banned for apparently fighting the good keyboard warrior fight for too long.