help me in doing what exactly? he's saying about playing with randoms, not playing in a team with same people. In such case you'd have to point out your teammates' mistakes. But if you're playing with random people, why on earth would you care about how they play? you should be concerned with your own performance.
but sure, let's say he's an idiot and for some whatever the fuck reason it can be, he's trying to change faceit community, one person at the time. You think someone after hearing shit like: 0.9 kd you dont deserve to have 3000 elo, quit faceit, dont play this game etc. that they'll think "holy shit, he's right, I have to improve"? No, nobody gives a flying fuck about what some lunatic on faceit says. They'll either stop talking to him, mute him, or ruin his experience if he's ruining their's.
plus don't act like there's some positive edge in his actions, because there isn't. He clearly has some mental problems, and he's letting his frustration go by raging on his teammates.