Why so much toxic and aggressive behavior?

So I kinda stopped playing after my original account was perma-banned because i was defending myself and other players who did nothing wrong from toxic players of the community. And i know what some will say; "No you were probably the one being toxic" or something to that effect. I came back and immediately i'm greeted in every game I have played thus far I have played, someone has found some reason or another to pick on other players just because they are having a bad game, they are disconnecting every once in a while or they were already in a (excuse the language Riot) shitty mood and the game started going sour.

So I guess some of my questions is why is everyone so against people talking while playing? It's supposed to be a FRIENDLY game, not a toxic and hostile game. I literally played 4 matches tonight, every single one of them had an issue with someone in the game or just snapped for no reason when the team we were on started to lose. In another match, not only was i bashed for not having flash; AND BEFORE ANYONE SAYS ANYTHING!!!! READ THIS FIRST! I play WORSE when I use flash so I stopped using flash, I also know my tendency to hide more and play "safer" or technically passive which (which i usually play as) if i'm the adc i need to be up there getting shots off not standing in the back waiting til they get them low enough especially being I am the one doing the most dmg as adc (just an example). The other part I got bashed for is playing Illaoi support.....Thing is it works GREAT and i know this for a fact, ONLY IF the adc works with you, I've won many games as support like that among other supports. (Yes i understand she's "not support material" not my point. We are supposed to be able to play the way we like, try and find things that work for us and help us stand out and who knows maybe exceed the better players otherwise we start again from scratch.....with the general toxicity of this game and other games like this, it's hard to actually enjoy the game when you can't find a group who won't quarrel.....which leads me to the next game, I was adc in my fourth game.....the support was karma.....I know how op she is when done right. Not only did she spend as much time as i did talking, and i did it when i was enroute or dead mostly as i can do nothing useful for the team. She tries to tell me i'm talking too much......just because I was having a discussion with another team member who was hurting bad as she was jungle and being countered hard. yet when the game was done, she had not only called me mental, but retarded and a few other names for trying to help a team mate our with using a different approach. I instead of lashing out or fighting back because i learned defending myself isn't an option in this community anymore, i muted her and reported her at the end along with the zilean who also called me retarded and stated outright that he reported me when i'd given no warrant for it.

Sorry for the long post, I'm trying to seek opinions and thoughts among other things because I can't play a game I can't enjoy anymore and it's testing my limits. So I guess in general; the questions stand, why is breaking the meta a bad thing now; why don't ppl have friendly conversations anymore and why should those having a bad game or ended up making a few bad plays have to suffer through this? And one other things before i forget.....Flash, is it vital or situational? The person i was talking to felt it was vital and i was asking her why, and i will state this if i already haven't, I don't use it because it worsens my game even with perfect timing.