This mentality is kind of what's poisoned League. Way back when, it was so fun and free. Everyone just trying to win in their own way. All these unique styles and off the wall ways champions could be played. Now everyone's hardcore, pedal to the metal "WIN OR KILL YOURSELF" about everything. If I want competition, I'll play a sport. I have kendo for that.
Video games should be enjoyed. Even if you're playing to win, even if the competition is intense, it should all come back to everyone having fun. Not that you necessarily do this, but people who trash their teammates for a bad game and force them to defend themselves with their match history not only tend to ruin the experience for their teammate, but are also clearly not enjoying the game themselves.