Derek Carr - Why People Dislike Him (IMO)

Because he's a phony and it's very easy to see through

Cart’s that dude who hacks you to pieces when he’s guarding you in pickup bball, but will immediately call a foul if you get in smelling distance of him

He might not have always been like this - end of his tenure with Raiders might have done some lasting psychic damage
He might have even corrected a bit if PC and the Oline had done better at beginning of season
But now that he’s in full ‘it’s everyone else’s fault’ mode, he’s becoming one of my least favorite saints ever

See, that's the thing, Mahomes' anger was directed towards the refs eventhough I believe it was a culmination of his frustrations with his receivers leading the league in drops. He probably doesn't even realize that his actions towards the refs were off target because he's not that guy. Carr has repeatedly shown that he is.
You’re correct In everything accept you’re making an exception to the player that has more wins. The old man ref deserved the rage coming from Mahomes? Imagine if his team wasn’t holding him back. I can’t see Carr brutally beating an old man. Or even getting nice to nose yelling at him.