Are there trolls in ranked (more so in lower ranks)? Absolutly.
WIll they ruin your game? Garenteed.
Can this ruin your elo and place you with players with less skill? Yes.
Get use to it. There will always be people that are unsupportive, trolls, and the like. It sucks, its annoying, it creates forum posts like this, and I feel your pain. I'm not a "high elo" player, but I've had my elo drop 300 points before.
But you know what? I started coming back up. Why? I kept at it. Complaining and blaming will only make matters worse because getting angry and annoyed will make you play worse.
Here's my best advice. Try to stay as positive as you can. Be friendly, adapt the the roles available (you don't always get the one you want), and give helping advice, not hurtful comments.
Will this win you every game? No. But it can help keep you calm so you don't start making bad plays.