Before you start playing ranked...
... play jungle and support at least 20 or so games so you can know what is expected of them in your elo. There have been too many games where I get harassed as the jungler because one of my laners has had to wait 10 or so minutes for a gank, then they proceed to troll. It's really annoying when you are trying to stay ahead in gold and xp so that you are strong enough that a gank will be a guaranteed kill or flash burned. I'm not claiming to be a perfect or even a good jungler, but sometimes people can be unreasonable. This should also be true for any other lane, I personally used to think all adcs are trash but after playing adc a few times in team builder I realized it was harder than I thought. So basically play every role, especially jungle or support, before you start playing ranked so you know how patient you have to be with your teammates.