"I'm Done"
This statement is widely heard all too often. Karma last game, I wouldn't give her blue and then she would say... Karma: "I'm done, fucking troll Udyr"... and of course I was glad she didn't get it, because she died to Akali a minute later (basically every time). The Blitz. Cait pings for him to fall back because Akali is roaming top and bottom constantly for easy kills because she is ahead and they don't have a sweeper yet. Blitz dies and says "I'm done, Cait wtf are you doing not helping me?"... We lost, and yet what I didn't like was how much of a negative attitude these players had. Some people don't seem to realize that being negative invites others to be negative. No you don't have to turn around and give them a taste of their own medicine, but certainly when you are already frustrated while losing, you are much more tempted to. Look, people who say "I'm done" " or wtf gd troll" or anything negative, I understand how you feel when losing and I know it's frustrating, but outright flaming your own team doesn't help anything. If you were playing with friends, would you be yelling at them and telling them to quit and uninstall and be calling them trolls or anything bad? I think not. Have some common respect for others and at least try to be neutral, and who knows, you may find yourself in more games with turnarounds where you normally would have lost. A bad attitude alone can easily change the tide of the game, as it's very distracting, and tends to bring about your worst gameplay.
tl;dr : Negative or bad attitudes need to be halted, as they don't help anything. At least stay neutral, and try to maintain a calm state. Just breathe