Anyone can have a bad game.
But other than that it's Yasuo so let's flame him for playing Yasuo.
To be fair it only has a 50.89% winrate. It's not that overpowered.
And yasuo is a champion on which it is very easy to make mistakes, which is why people feed on Yasuo very oftenly. He's a high risk high reward champion.
But then you act like Yasuo is the most overpowered midlane pick, and since this is memes and games, there's not much to say about this neither.