Why are people in this game so stupid?

Seriously, the last three games I've played today, I've had people straight up bitch at me for not going into a 2v5 while they had Baron. It's like, what the fuck do you want me to do? But, in all seriousness, I'm basically to the point of not wanting to solo queue, because everyone I get matched up with is just straight up terrible, and I lose because of my team every game. Therefore, I can't go up any ELO, and then I just get even worse teams. Like, what the hell is the secret here? Why are people in this game so stupid and mean?