In my experience, I've found people are more toxic in norms than in ranked. Though, on the occasions when I get a lot of toxic teammates in several of my games, I invite a friend to duo with me; that way at least there is one less person raging on the team (unless you invite a rager, then shame on you!) XD
Somebody mentioned to me that if you go into games assuming they'll be full of toxic people, then you'll be more attentive and sensitive towards the negative behaviour of your teammates whereas there may still be lots of positive aspects of their behaviour going unnoticed by you. So, reducing your tilt and changing your view of your teammates, may help you.
Good luck! :)