I'm not sure what you're remembering. Is this really all just about the Chipotle thing?
The guy was given a lot of rope and plenty of chances to win this fanbase over. He truly started to lose fans around the Jacksonville game in 2023. It's one thing to have bad games, it comes with the territory when you're a mid-tier quarterback. But when you're throwing tantrums on the field and throwing other players under the bus, it's going to start to unravel. I think this fanbase has shown it'll root for any genuine and likeable player, regardless of consistency of play. But what do you honestly expect when a player makes zero effort to connect with the fanbase and is clearly standoff-ish, goes through spurts of playing poorly (coupled with the team losing football games), and constantly looks to throw his teammates under the bus (instances of passively and aggressively)?
No one cares about Chipotle. It's a meme and low hanging fruit to make fun of the guy. But it has nothing to do with why this fanbase doesn't like him. None of this hate he gets from fans would be a thing if he was a consistently good football player, wasn't a jerk to his teammates, and showed even an ounce of personality. Instead, he's the Dennis Allen version of quarterback. No one likes someone who seeks all the credit, but wants to shoulder zero of the blame.