Toxicity should be dealt with according to the player's rank/stats
Tbh it doesn't matter if you flame as long as you're actually good at the game. Had a
who massively flamed a feeding midlane
as well as the rest of the team and didn't really blame/report him as he stomped his lane and tried his hardest to carry teamfights while the yasuo kept splitpushing and feeding his ass off; we lost the game as the enemy mid laner completetly outclassed us.
Now some people gonna prattle how toxicity destroys games and ruins the fun aspect but that's just silly. You can always go on and mute the flamer but you CANNOT ignore the feeder who will you cost you LP and fuck up your MMR (my MMR dropped from plat 5 to gold 3 off that 1 game somehow, but that's besides the point).
Idk about others but I'd rather have an ultra toxic Singed over a garbage ass boosted feeding Yasuo any day of the week. If you have good overall stats and did well in a specific game you should get the right to flame the monkeys that hold you back from climbing, that's the very least they deserve. However if you're a silver 4
with negative winrate and try to talk big then you definitely deserve the ban hammer.