Why "defending yourself" isn't worth it.
We've all been there. Maybe its the jungler asking how you lost your lane after he gave your lane opponent double buffs. Maybe It's the mid lane demanding you learn how to jungle because it's 2:32 and "you should've ganked by now". Maybe it's the adc spam pinging missing on you because you didn't soraka ult him at level 4. Hell, nowadays with dyanmic queue, maybe it's a four-man premade that is sure that the only reason their bronze 5 buddy lost mid, is because Nasus doesn't have 800 stacks at 10 minutes.
Being blamed and flamed for things that aren't your fault sucks. It's totally rational to feel angry or defensive about it.
But you shouldn't flame back. You should just mute them.
Why? Because these people who are flaming you have already made it clear, that logic and reason is not their primary concern. They don't care what you have to say, they're just mad, and lashing out at the first target they see on the minimap.
IT DOES NOT MATTER IF YOU ARE IN THE RIGHT, BECAUSE THEY DO NOT CARE IF THEY ARE WRONG. Flaming back just makes you angrier, makes you waste time typing, and gives them an excuse to report you.
Muting them instantly removes any chance of them flaming you, makes your "report card" look super good in the eyes of the report bot, and lets you focus on the game.
You can defend your honor in the real world, where it matters. Don't waste your energy on morons with an internet connection.