the reason why this game is so toxic is simple
Its because the role of "Jungler" exists. The most retarded and ridiculous role in a soloq game to have .
well the actual reason is because people hate dying unfairly, people might hate dying but there are many people that are able to recognize and praise a more skilled player than them, but in league its not the case because its unfair, and this brings me to junglers
as long as junglers exist as they are, able to faceroll their jungle camps from lvl 1 so they are always healthy and can always gank a lane, this game will always be toxic and never be fair. There is no way you can play "safe" so you dont get ganked by jungler and still apply the same pressure and presence on lane, you WILL absolutely lose CS and even harass if you constantly play safe and that doesnt guarantee you wont die, as they can just tower dive you even pre 6. You can't play agro either because jungler can just show up, in the end all that is just "luck based", it depends on the thoughts of both junglers and if they noticed whats going on or not.
As a main Mid Laner, for some ridiculous reason to me, i get camped in 19 out of 20 games i play and i get help from my jungler in one out of 20 games, which are easy wins. Enemy plays super agro against me , they flash forward and just shove me constantly but my people absolutely never help me and then i decide to start playing agro, im about to kill the enemy and yes you guessed it, i just get ganked. Its not selective-perception or cherry-picking or whatever, its not my positioning either, some people have more bad luck when it comes to jungle than others. So why the hell should jungle exist in the first place? Its a stupid , unfun, game-breaking and way too viable role. Most LCS players use jungle to climb up from lower elo, everybody knows that jungle carries the most simply because it can always make the game unfair.. and once you snowball a lane, because this game is also insanely snowbally, the unfairness goes even higher than it was before - resulting in more pissed off people than before. I more or less know my matchups and am able to win against the enemy most of the games i play but that doesn't matter because i play 1v2 while my team has 4v3 but they aren't doing anything with it, mainly because my jungler is just farming anyway. I don't really feed when i get ganked but because league is so snowbally , once you are set behind you can't really climb up unless something happens, which is mainly up to your jungle once again. They have way too much freedom and are able to 'break' the game all over the map
People hate unfairness, i hate unfairness the most. This game is loaded with it. I just lost another game in which i was winning lane and then i get tower ganked and i even flash backwards but their jungle flashes as well. He repeats the process 5 minutes later. Best part is that i played Ahri against TF who had no flash and was shoving half of the time and my jungler didnt once think about coming. Its impossible to communicate with these animals in EUNE but even if it was, why should i? Why cant you just rebalance and fix your game so that it isnt filled with unfairness. I had a game earlier when i played Lux against Yasuo which is one of the hardest matchups for Lux to win, and i somehow won because the guy was kinda obvious and he was constantly sitting on 40% hp on my turret, at some point he was recalling on 80 hp near their tower and raptor camp, which my jungler was farming at 100% hp (a Vi who could just Q him through the wall and get kill), and that yasuo had no flash for 90% of the game, yet my jungler never once even bothered coming. I know this isn't game's fault but player's fault, what im complaining about is that jungle role is just unfair and shit, it makes lanes unfun (Literally) and it even baits you into fighting when your guy is around and you'll always sort of have hope that they aren't blind and pop over, but most of the time when your jungler is farming near you hes not even watching the lane for whatever reason.
You cant have junglers and this item snowballing at the same time and have happy community, people are rude in general but they aren't as bad as league makes them and the reason is quite simple for that.