Why is Silver so toxic?

So today my goal was to get to Silver 1 (Currently Silver 2) after couple of games and winning a 4 v 5 due to a player rage quitting I was one win of my promos to S1. In that game I encountered toxic premades that would play normally while bash you with their toxicity until they lost their lanes and started to troll. After losing that game I went to take a break and won another game which put me into 1 game away from proms yet again aaaaaaaand in the next game I encounter another AFK due to rage quit. After that I was so pissed off and was really asking myself why is Silver so toxic. Please could you give me some tips on how to avoid AFK's and trolls thank you.
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