The truth that flamers need to see
I've had to deal with flamers forever. Flamers who sit and play the game, questioning all of their teammate's plays, while they act like their shit doesn't stink. Acting like they're somehow Apdo, even though they're making the same amount of mistakes everyone else is making.
Recently, LS coached a flamer, and he told the truth to him here: https://clips.twitch.tv/AlertDependableLaptopKappa . It's not about your teammates, it's about you. There is no reason to focus on what your teammates are doing, because if you focus on yourself you can improve to the point where the teammates don't matter.
I recommend watching the whole video here (starts at around 4:40). At the end LS offers to keep coaching this guy because he HAD to make him see how flaming is holding him back before he could get on to the actual coaching.
Basically, don't be a dick. It doesn't get you anywhere, and there's literally no reason to be one. It's not going to magically make your teammates play better, instead, it's going to detract from your own learning, and instead of being able to improve you're going to stagnate while it's "always your team's fault". It's actually ridiculous how many blame your team posts I see that get upvoted lately.