Don't be that high elo player.
https://gyazo.com/e4419a21e4cdb43f4138c3e6b56aed9a I'm trying to be less toxic in my games. I really am. but when the game starts off with me calling support and having annie autolock, take my lane, and then flamed me for giving up a kill to a syndra who was dropping down to gold/silver with friends to play with them, it's really hard. I managed not to be super toxic, i called them assholes and scumbags about once per insult, but when the enemy syndra was repeatedly calling us low elo idiots and the enemy elise flaming us for being bad and copying her build (elise mirror match), i was definitely far from the worst in the situation.
If you are going to climb up to the oh so great level of being slightly better than 60% of the playerbase, don't act like a complete asshole when you go up against people far lower skill levels then you. Especially, and i repeat, ESPECIALLY, when it's a NORMAL, the enemy is forced to play poppy mid, with SUPPORT runes and masteries, the least you can do is repeatedly call them shit at league. At the least you can just accept that they are worse than you and take your free S grade, what you could do is give them tips on what to do to help make them a better player, but i know that is a bit too much to ask.
just don't go out of your way to flame people that are bad at league when you are intentionally dropping down to their level.