I just had a game with a 3 man premade on my team, who all picked GP, I picked Ezreal, and the other random picked Pyke. We got Ezreal, and the moment we got into game 2 of the premade decided to flame in all chat to the enemy Pykes about how Ezreal was a troll pick and a useless champ. One of them went mid and the other 2 went bot. The bot laners started feeding hard, and by the time they were 0/6 each (at about 10:00) us top were 4/2 each. So, the mid laner, the brilliant ray of sunshine that he is, starts flaming us about how bad we are, even though we were doing the best on the team XD
Long story short the premade wanted to surrender at 15, we didn't, they flamed some more, and we ended up winning that game 10 minutes later, with the random and I on the top of the damage charts, and the premade getting carried. I'm just thinking the whole time, "Just because you wanted to cheese some randoms with your 3man vote priority, doesn't mean you get to flame everyone else when you're bad at the champ you didn't pick," lol
I forgot to report them after the game though. Oh well.