My experience leveling - people are actually not that bad
Like many players leveling I'm forced to play blind queue. Judging by the negative rep the community has I was prepared for anything and everything. Instead, I encountered a relatively positive environment, people that religiously respect role-call order and don't bicker if they don't get their own role, or even ask for their preferred role. I'd put this type of quarreling in maybe 10% of the matches, maybe even lower. People call out support fairly frequently, and never once did I see someone complain because they ended up in the support role.
People will trash talk in games but it's obvious that they're a minority (small small minority with loud voice).
I had even less of a situation with toxicity until I reached mid-levels.
After all the negative talk about community and people being scared into not leveling their accounts just to not go trough the horrors I felt like it's important to share this.
Please feel free to share your experiences.