I have played the majority of competitive multiplayer games and LoL is the most toxic by quite a bit. The game is also the most punishing and long-winded by quite a bit with the slowest ranked climb, so no mysteries here.
That being said. It IS rare to have someone actually do something game ruining, with that being their intention from the outset, and most of the flame is moderate-mild. I’m pretty thick skinned and don’t really care about insults, I only mute people who are typing paragraphs of whining because it gets annoying to keep seeing flick across my screen.
Kinda seems a little crazy you get flamed for dying once in an early 1v1?
Don’t get me wrong the game is toxic asf but I can’t recall in recent memory anyone flamed for giving first blood unless than face checked an invade or something.