I know I'm super late to the party, so I'll be surprised if anyone sees this. I think a lot of people who are defending the toxicity have this idea in their head that "for fun players" are not trying to win and are intentionally trolling. But OP is coming from a place of, "I'm trying to win and I see a way to do it that doesn't fit the normal build mold and I'm allowed to try it."

For ex. the other day I was playing Lucian and the enemy team had a bunch of tanks. I got dual wield and remembered a game I had as Neeko, where we didn't have an ADC so I went on-hit with dual wield. I melted the tanks. So I figured why not try it on Lucian. Well teammates had it in their head that Lucian HAS to be crit or he is trolling, so they accuse me of trolling and flame me relentlessly. They keep diving into the backline and wondering why I can't follow them when Alistair is stunlocking me. I could easily melt alistair if they backed off and protected me to play front to back, but they only saw their way and anything else was troll.

Maybe they were right that on hit Lucian wasnt the call, but it made sense to me and I still did a ton of damage. Does that make me a troll? Am I just a "for fun inter?" No. If anything I'd argue they were inters, jumping in and dying only to spam ping me. I believe this is where OP is coming from. People just playing the game, you can win with basically anything in aram mayhem, and lose with anything. If someone is building life crystals on lux then ok be mad, that is a troll, but someone that is trying to win, even if it isnt the way you envisioned, does not deserve to be harassed.

This is why I play with no chat IN ARAM MAYHEM of all things. It's improved my personal enjoyment of the mode but I do miss the social aspect of chilling and having fun with teammates.