Why I think people struggle with the definition of toxicity in league.
Streamers.
Watch any given streamer on any given day at high elo flame their teammates in chat for multiple games a day and go unpunished, I won't name names, but there are plenty.
Now average bronze 3 Joe watches streams trying improve their play because they really like league, only to find when they type "HOW THE FUKC CAN O NE PERS O N BE SO F {CIKN USELESS" receives a 14 day ban, they come to the boards and post their chat logs, and are like "How is this toxic?" and then some one usually responds, "your definition of toxic needs changed", but they see their favorite big name streamers doing it all the time, how could it be bad?
I feel bad for new players to league, and players who are get emotionally invested into games. I have found calmness and laughing at angry people the best way for me to play league (after a few banned accounts...), but I think I understand now why people are confused on the summoner code - it doesn't apply to all players evenly.