I think part of it is that the Pats and their fans embraced being the villains, they knew everyone outside of Massachusetts resented their success and thrived off of it. What's so offputting about the Chiefs dynasty is this weird mix of entitlement and persecution, that their fanbase has.
Like even
@Meat Target kind of exemplified what I was talking about a few pages back lol. Uwu we're just a smol bean market franchise, pwease be nice to us on our way to our 5th championship in 6 years. Fuck off. No Pats fan would be whining during their franchise's heyday about being hated, if anything that was part of the thrill for them.
Hell, Philly are the underdogs and even I get some people hating us, our fans are obnoxious assholes, I'm not gonna cry because not everyone likes us. No one likes us, we don't care.