Believe it or not the community is on the toxic side
But but but...
Exibit A) our forums. Funny how we're little love muffins in game, but are pretty horrible to each other and the Riot staff. Calling someone an idiot because they ruined your champion is toxic.
Exibit B) When someone gets banned we almost cream ourselves at someone's downfall. That's toxic...that's like taking joy at someone being sent to prison. It's one thing say "good justice was served" it's another to talk about drinking their tears like you're Eric Cartman.
Exibit C) Riot doesn't believe the community is positive. Ideas are turned down because it'll lead to more toxic behavior. For example: allowing games to end without penalty due to AFK or DC. Basically they believe if implemented non meta champ players and feeders will be bullied into AFKING or DCing. How does that work if the community is mostly nice people? Or are we admitting there's likely more jerks than we want to admit?
I believe the community needs to focus on sportsmanship and tact.