if you did a terrible job on an assignment and making a million mistakes, would your boss not yell at you?????!!!!
Probably not. My boss can recognize that humans make mistakes and will try to work with me on improving. Believe it or not it's not profitable to yell at your employees. Infact treating your employees right has a track record of success in increasing productivity.
But let me tell you about my coworker:
He was equally ranking to me in the workplace, but everytime he for whatever reason werent successful at his job he would blame others, call them slurs and yell at them. He got fired because he was an asshole and no one wanted to work with him.
Ok tbf that's not a true story, but it's a better metaphor than the one you're using.
You're not ANYONES boss in League. (Unless you own an esports team I guess)
If anything you're the annoying coworker no one liked to work with. I'm not calling you an asshole, you probably aren't, but if you've gotten permabanned it's because a large amount of people don't want to play with you.
It's just a game. Don't yell at people for making mistakes. Especially not when you're in Silver. (I'm only barely Gold V, but I don't yell at people for their mistakes).
A tip for next time: If you have something toxic to write, don't. Say it out loud instead if you have to, so no one will be affected by it.