Well, that's how people are these days. They never take responsibility for their actions.
However, you can try to learn from that, too. If you watch high ELO streamers or YouTubers, they always blame themselves when a mistake is made. Something like "aw, I shoulda played that better" or "aw, shouldn't have been there" or "I should've gone and ganked them earlier when I had the chance, now that lane has snowballed too much and I really can't." The jungler often gets blamed when things go wrong, even when there was nothing they could have done in that situation, but there was something you could have done to prevent that situation. Yes, your teammates played badly, but you need to play better to cover it up when they play like trash. And I do understand that you can't be everywhere at once, I've been in those games as the jungler where every lane lost and is asking for help, and it's just not something I can offer for a lot of the lanes. Their top laner got ahead and is really good at 2v1's, their jungler was just spotted near mid so ganking that leaves me likely to a countergank, and bot is pushed too far up for me to do anything. And then, when my team leaves me nothing at all to gank, I get yelled at for farming instead of ganking. However, if I had communicated with bot, "hey, if you let the enemy team push, we can kill them and then do dragon," they would've let them push, followed up by a dragon, and possibly a turret if we had time. By making this post talking about how garbage your teammates are when YOU did nothing to cover their weaknesses, you're being no better than they are. And yes, I know that situation, I know that feeling of tilt when you're getting yelled at by your whole team for not ganking because you have no options to gank, but you really just have to. Sometimes, you just gotta bite the bullet and swallow your pride and accept that, by not doing something when you could have, you allowed your team to fall that far behind.
As for them reporting you, that's a whole different story. It's stupid and something they shouldn't be doing, you're just trying to help them. But they don't realize that. It's typically better to communicate with pings instead of the chat box or just not talk at all. All using the chat box does typically is tilt your teammates harder and then they play even worse, or worse, start inting/afk. I have before carried games like this by taking control and making shots, showing my team that I can lead them to victory if they're willing to follow my lead. Communication is typically the biggest issue that causes games to be lost. So, communicate. Tell your bot lane to let the enemy bot lane push to make an opening for you to gank. Tell your mid lane to ward up and play passive so they don't get killed by another gank. Tell your top lane you'll be there when you can, but there are better targets to take for the team as a whole right now. Instead of complaining that they're doing badly and blaming you, tell them how you win this game. Miss Fortune, you outscale Varus pretty hard since you can layer your ult over their entire team and I have some amazing cc to lock them in place forever. I'll help you pull ahead of him so that you reach your stronger mid/late game point sooner. Lux, you'll be able to poke and kite, and Poppy, you're a tank. Stop trying to crush your lanes because that hasn't worked yet, instead, just sit back and farm up, get as much gold as you can off of CS without pushing the lane. I'll come gank you any time I have an opportunity if I think it'll be successful. Just let me get a bit of extra gold in bot lane first and help them catch up. The point that I'm trying to make here is that you could have done something to try to carry that game instead of just rolling over and tilting to death. This game will tilt you. It will make you salty. But, you have to control your mind and keep a clear eye on the goal of victory. With these types of games, you carry by establishing yourself as a leader, proving to your team that you can win if they do what you tell them, and then giving the orders to bring them to a win. I remember a game I had a while ago, playing Kha'Zix mid around the time of the Mage update, my team fell incredibly far behind, but I got myself a lead in mid lane and I carried, not by mechanical skill, but by game knowledge and shotcalling. That game was difficult, and it was the longest game I've played in the 6 years I've been playing this game at 75 minutes, but holy shit did that win feel satisfying as fuck when we finally got it. I remember looking at the team gold advantage chart and seeing that at one point, my team was over 20k gold behind, and we still won.
Lead.