Issues with ranked toxicity

Hi there, I am davidkuo, an unranked player fairly new to the whole idea of playing in ranked. I have only played 4 placement matches thus far (2 win 2 loss for anyone who wanted to know) and I have already experienced the brunt of how toxic ranked could be. I am not talking your average toxicity, I am specifically referring to toxicity that makes no sense. I was in game with a team who were toxic because I was, "too positive." To quote the sona from the match, "Ok mister positive, if you don't shut up about team play and working together I am going to afk." Now, I was not being rude, or even condescending, I merely was saying things like, "its ok that you died, just try to play a little safer, this game is still very winnable if we play as a team ^.^" Personally, I find that a community so toxic positivity is literally seen as something to despise to be problematic. After all, how do you win in a game where before the game even starts you have someone who says he has a 25 game chat restriction and is very vocal about how everyone should just shut up and let him carry before we even get in game and starts a fight about how he needs to be mid to carry us, "bronze life scrubs"? Why is it that in the most important first ten games of the season we can't do a single thing about a game that starts like that? Can we not have like, one free dodge a day or something like that? Something to keep us from having to play a match we are all but guaranteed to lose? I just want to know what we could do to solve the massive toxicity problems in game because trying to stay positive and play the mediator only means that I get distracted trying to help a team who is going to hate me for trying to stay upbeat.