This Flex Q non sense

I have played a lot of ranked and normals games and Ive never once left a game until today. It is so ridiculously unbalanced, its just a joke. Silvers and diamond 5 in same game? Completely absurd. My top was hard feeding and trolling, bot was getting smashed. I was jungle and I helped all I could, i was always positive and I never blamed any lane. At 20min I try to FF and they say no, we continue to get smashed, I do the second FF and again, its 3 yes to 2 no. I just left. All my teammates were flaming and blaming each other anyways, I have no idea why they would not surrender. Maybe they wanted to make their other teammates suffer by continuing to get stomped. I try and be a good player but I know when it is a lost cause, there is no point to continue a game when the team is flaming, feeding, and everyone is having a bad time. I'll be pretty upset if I get punished for this as Ive always tried to be a good teammate that never flames my own team.