Don't know whats wrong with this community

So, I'm trying to win my ranked games because I'm tired of losing my games. So in my most recent ranked game. This guy gets bot and his only champ gets banned. he starts saying like WTF THAT WAS MY ONLY CHAMP being a bit toxic and all. Then in game late game when I'm level 18 and the team is like 16 and the vayne is 17. We lost our inhib because people decided to split and not come mid when ALL 5 OF Their team membs dead. Decides to roam bot and top only to push one wave while me im still pushing mid, they do nothing. I tell them wth guys you should've came mid why did u guys split. This was at level like 16. At level 18 like earlier I told everyone don't split. then I said u guys cant split because u guys don't destroy turrets fast enough. This vayne says LOL I Have GUANJIOO or something and then Splits right infront of my eyes. I said dont split and then he said lol ok and then I said fine split you're going to lose us the fight sarcastically and he ACTUALLY went to split. Then their team comes running down mid 4v5 and we lose the fight. A level 17 yas backs and kills this vayne because he split when I told them not to. He's the top but yet isn't helping our team. I said report vayne and then I start freaking out because its a 4v4 with yasuo backed and we're going to lose because of this vayne and then vlad says kha zix ur being toxic u being toxic wont help the team. 1 second after he says that boom its a 4v4 and guess what? we lost ofc and then vayne says something and then I said we lost because u decided to split when I told you not to. then he replies with u told me to split he clearly saw my messages saying not to split and was smart enough to realize it was sarcasm and I was being sarcastic because he was being sarcastic earlier in the game, i do /all report vayne gg. we lose and then after the game, vayne says I split because you told me to split kha and then vlad says report kha and then vayne says report kha and then the actual mid laner that switched with vlad who was xayah said report kha. I only freaked out because I didn't want to keep losing my ranked games. Can I not be frustrated about a dude trolling? The whole team had a negative score and said report me when i had a 2 KDA. I'm not insulting them or not trying to I'm just trying to get feedback because this is so stupid. the vayne keeps cursing throughout the whole game and complaining about their Kayn but when I complain about him he turns the whole team back on me and then i have 3 or 4 reports because I said report vayne and I told you not to split. the whole team didn't split besides vayne we were defending and this dude goes to do 50% of a turrets health when yasuo backs and kills him without taking any dmg. then he says omg u guys were supposed to stop them from backing. Who's to blame? Honestly, the team was toxic besides the adc and support who were xayah and rakan. I even camped top and mid and they are still complaining and being toxic. Please give me feedback, I'm not trying to get banned. I'm just really mad and confused about this...