How can people play ranked?

I hardly ever play ranked, today I thought I'd come back to it after 2 months, but the second game I play the enemy invaded, so our Twitch jungle started literally running it down mid and top, going afk and then inting again. I don't experience this kind of behaviour in 100 normal games, but ranked is just full of trolls. How are you supposed to play ranked when more people int you in 10 games than they do in thousands of normal games?
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