Surrender at 0
This has happened for years, but this attitude is starting to surge again. Over the slightest thing, be it a missed minion or the ADC forgetting what the fucking Relic Shield is again (it's been four goddamn years), the entire team will collectively throw up their hands and just give up, and STOP. They'll just fucking stop and wait for the moment they can surrender.
What the fuck are you even doing jumping into a game if you are going to waste your and everybody else's time? If that's going to be your attitude, don't enter a game, don't log in to the client, don't even turn on your computer. Just lie in your bed and don't bother anyone else with your bullshit ever again for as long as you live.