Why Do People Hate Fiora?

So I'm a Fiora main, I'm sorry if you're instantly triggered... I just played against a Lee Sin top, he got demolished. But that was to be expected as it was his first time top with lee. I end up getting fed, and for some reason. The Jhin on my team (mid lane) starts saying how bad I am, asking why I'm split pushing and not helping him. He's not the best Jhin player, I can excuse this because he's a new champ. He starts harassing me in /all chat and their Malphite (support), Lee sin (top), their jhin (adc) all agree. Everyone on their team except Diana, who was fed. Note: Diana was the only one that could kill me in a 1v1, and it would be close, I'd have to hit all my ult vitals. After the game Lee Sin calls me a noob repeatedly even though he was demolished in lane, Jhin also said the same, and Malphite. Being a respectful person; Diana said "gg, fiora". We lost the game because I couldn't carry harder than Diana.

Oh I forgot, their mid laner, the Donger. He was probably the worst offender of harassment in-game, not much post-game. Its quite ironic he was saying I'm a noob and bad and should kms. I had better stats, and more cs.Plus he's playing Heim, not exactly the hardest champion...

Okay! Venting and frustration aside, why do people hate Fiora? Why not as mechanically difficult as Cassio, Lee sin, etc... She still takes skill. Theres an obvious difference between a good, bad, and great Fiora. I played Kayle 10 times, with a win rate of 90%, always winning lane. Now these were my first games as Kayle, ever. People don't say Kayle is overpowered, or easy to play. I don't understand why theres so much hate. To the point where a person on my own team, someone I hadn't said anything bad to, said I was a terrible player. TO THE ENEMY TEAM (I didn't insult anyone that entire game)

Why get mad at someone who has done nothing to you? Was he frustrated from losing to Heim? He didn't play Jhin like a sniper, more of a.... vayne kind of way.