It might be just me, but I've been noticing that people are becoming really more toxic lately. All they care about is winning. Even when they are doing poorly themselves, they try to blame the other people on the team. Especially in ranked. It is like all the nice players left, and the only the winning-obsessed douches remain. I don't know what's going on, but it's making me not want to play the game.
People have always been toxic.
ppl always tend to blame others the game grows so more ppl = more toxic players aswell
I think it's just the fact that most people just can't accept the fact that something could be their fault.
If they die 4 times in lane to 
their go to reaction is "GG my jungler never ganked, it's all his fault. Trash JG."
Or if they go even in lane but bot is losing it's "GG our bot lane sucks they threw the game" it's totally not their fault that they couldn't carry the game, "my team is just too heavy"
Not many people can accept that they did something wrong and that they could've won the game if they didn't make some dumb mistakes.
only bronzies and low lvl silvers blame others and nopt go 4 a combak, make sure to let em no thier rank in game
Things have almost always been this way, maybe you've just been lucky till now. I've been here since before ranked was implemented and if anything things have probably got a tad bit better since the instant feedback system was put in. You'll just have to learn to live with the fact this is how most people react when playing online team orientated competitive games, its never going to go away.
