While it's not nice of you to not talk it out before you make the final decision, it's just another issue players have to resolve between themselves. Their ways of retaliation, on the other hand, isn't acceptable. Report and move on.
In terms of outcome of the game tho, I'd say all of you are to blame. You have your reason to lose faith in new champ's performance in ranked due to ppl's lack of understanding and familiarity with it and I agree with you, but a good approach would be something like explaining your reason and reaching a point of compromise between both sides. Even if those ppl didn't retaliate the way they did, it's still going to leave negative impact and cause discord among the team.
Maybe it's because I haven't suffered as much as you did, I'd give ppl benefit of the doubt and let them do w/e. I mean, faker walked into a tournement when he played reworked gankplank for the first time, fired his Q at his 1st E barrel (next to him) followed by placing 2nd E barrel (next to his opponent) after the shot, hoping to trigger 2 explosions, and casters laughed about it. He still stomped that game.