team mates banning your champion.
That shit is the most annoying thing ever i really don't care if i have to wait 30 mins to play another game, i've had it happen to me more than 5 times in the past week where people in my team will ban my champion and proceed to say shit like "oh sorry didn't know" if i didn't care about my elo i would've proceeded to fight the toxicity with more toxicity but i just rather dodge and not deal with that shit.
fuck this game fam.