I think the answer to the question of hatred/wariness is generally no, it's not major, especially as I'd expect "adventurers" are a pretty common sight to most average townsfolk, and a Keeper adventurer probably wouldn't cause a second glance. Not to mention the number of average townsfolk Keepers who are average townsfolk. Now if you have an average townsfolk who has a good reason to be worried about poachers or who has a background steeped in hatred, then your Keeper might see it, so any given Keeper is probably aware of such reactions, even if they haven't caused a problem for them in particular. But I can't imagine walking into Gridania and getting mobbed with torches and pitchforks. To the grand majority of the populace, a Keeper would just be another member of said populace, unless they've been given reason to think otherwise of that particular individual.
My Keeper is not at all traditional, but I'm okay with that. She's got a dash of the tradition-breaking father akin to (and simultaneously nothing like) the Postmoogle questline along with a pinch of poacher/bandit culture from her mother, mixed in with attempts to rejoin traditional culture after the Calamity, all of which combined to give her an actual hatred/wariness of traditional Keeper culture. Given all that, it comes up almost never. It's just the kind of thing that seethes in the background for her.
My Keeper is not at all traditional, but I'm okay with that. She's got a dash of the tradition-breaking father akin to (and simultaneously nothing like) the Postmoogle questline along with a pinch of poacher/bandit culture from her mother, mixed in with attempts to rejoin traditional culture after the Calamity, all of which combined to give her an actual hatred/wariness of traditional Keeper culture. Given all that, it comes up almost never. It's just the kind of thing that seethes in the background for her.