People can be so unbelievably harsh about any player. I was reading through the post match threads for the last time we lost to Arsenal in the FA Cup three years ago and the way people were writing about De Bruyne and Silva would look awful in hindsight. At the moment people are being very harsh about Mendy more than anyone. Look how City fans have aggressively TURNED on Bernardo, who clearly needs support.
This however is the most annoying of threads. Jesus gets criticism, and many times it's deserved. But with Jesus people have a NEED to go out of their way and write why he'll never make it. People can't say, 'Oh he wasn't great today'. It's, 'Oh he wasn't great today and he never will be'. In the process to make their point, they will deify Aguero and act like he's never done anything wrong (similar to Fernandinho should be in DM discussion this season). "Well Aguero would have just dribbled around all 6 defenders and chipped the keeper, therefore Jesus is shit". I mean we all know how good Aguero has been and still is in fact, but making stuff up doesn't help. Unfortunately, in response you'll get some folks dragging Aguero through the mud to showcase how a negative quality of Jesus isn't so bad, and yeah that's irritating too.
What stings the most is two things. Firstly, this thing is ridiculously partisan. Jesus does something bad and it's, "Well Aguero would have done that right". Every time. But then Aguero cocks up and you have different people say, "That's it, we need to move on, promote Jesus". Secondly, 3 years ago all these comments were the same but in reverse. "Aguero's done, here's why Jesus blah blah blah." So the fact City fans can be so fickle is maddening.
And finally, the reality is, people just need a scapegoat, and people like to big up who's not on the pitch when we lose. Cancelo and previously Danilo are world beaters whenever Walker has struggled. Danilo is still being overrated despite not setting the world alight at Juventus. Foden is always the answer, except when he isn't. Sané's faults all disappeared last season. And when Jesus struggles, it's because he's not Aguero.
As dom says, it's almost certainly a team issue, but that would be complicated to shout at the tele, so we just slag the players off; there's no loyalty at times. So people criticise Jesus for not being Aguero because it's easy, and unfortunately some people go the other way because it's easy to. It's akin to the crappy punditry we all complain about from SkySports or BT. Lazy.