Is this normal for Bronze ranked games?

I'm a support/adc main in high Bronze (I try not to complain about Bronze Hell too much, as I probably deserve to be there) and I've had a hard loss streak in ranked lately. In a recent game, I played Sivir and we faced a much tankier team with a great Vayne/Malphite bot, while my Thresh was hooking in the opposite direction of the enemies. I felt like I was doing decent, not dying much at all early and keeping my CS high for a losing lane, but when we reached late game my team grew very toxic towards me. I understand the costs of suicide teamfights in lategame, and as an ADC I did my best to keep myself out of the ranges of their Sion and Malphite but it became increasingly difficult, and I found myself fleeing fights sooner to keep from dying because I wasn't fed enough to put out the damage and didn't want my team to flame me. Consequently, that's exactly what happened. All four team members turned on me and said I was the reason we were losing, although it was our Nunu and Thresh that allowed Vayne to get fed from failed ganks while I did all that I could while keeping myself alive. Mind you, at the point I started receiving the flaming I had a score of roughly 4/5/17 while they had slightly more kills (except Thresh), roughly double the deaths, and half the assists and they were much more tanky and had more CC than me, but weren't covering me properly in fights which is why I had to flee most of them. I kept calm and told them to stop blaming me and just play the game, to no avail. They would rather focus on directing the loss towards me and eventually surrendering 4/1 rather than actually try to win the game. They proceeded to talk like this in the endgame chat, reminding each other that I was the cause of the loss and that I shouldn't play League anymore because I'm a trash ADC.

Is this sort of thing normal in Bronze ranked games? If it is, I'm not sure if I can handle playing ranked anymore. I can't help but take things personally and I was even in tears by the time we were at the endgame screen because I just wanted to play the game and I didn't understand what I did wrong. I was never toxic towards any of the 9 other players, and luckily the other team seemed to see where I was coming from and I recieved an honor from the enemy Vayne. However, I'm not sure if getting pity from the enemies after a defeat is worth dealing with teammates like these. It's very frustrating because I love League of Legends and I really do strive to become great at the game without sacrificing the fun of playing a game, because that's what it's meant for.