How should we deal with toxic, disrespectful teammates?

All right, I used to smurf a lot the last 2 years. Let's make that clear, smurfing, not boosting (main was d1 in season 3, now unranked because of boredom and studies). Too often I come across to people that are really rude, selfish, bad players and sometimes they actually sabotage my laning. A couple of years ago I was the ideal Summoner, always cooperative and kind etc. But man, I got tired... Toxic people keep coming and coming and honestly, I don't have the patience to help them anymore. When my teammates are kind, I gladly offer my help, my constructive critisism, I cheer them up, I carry them etc. I have added people, for further help etc. And I am always kind and cooparative at champion select, habits that helped my rank up pretty fast at seasons 2 and 3. But now, when I meet those mean silver - gold dudes and they treat me so bad for no reason, and then try to destroy my early laning phase as well, sometimes I get so frustrated that I decide to throw the game or leave it. I know, I shouldn't, but I 'm a simple man. I don't know what else to do, I have run out of patience. Any thoughts?
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