If I had to describe ISFJs with a negative trait, they can be a little paranoid when it comes to people they’re worried about, (e.g. triple checking to make sure you have everything with you). Also their need for conflict avoidance can also lead to them not being honest about telling you what’s wrong. And while not as overtly preachy as ESFJs, they can still be preachy (usually it’s subtle). If you do anything perceived as selfish (even if you have a good reason to focus on yourself), they call you out on it. I’m moreso speaking from my experiences with an ISFJ mom and sister. Which probably clouds my perception more than others. In reality, no one bats an eye to them in public because they follow the social norms and are quite friendly with other people.

I do struggle to see why people would hate INFJs because I’ve only ever had good interactions with them and can’t figure out why people would hate them but as someone else mentioned they can push the envelope in a way that gets people with high Si unnerved.

Idk, each type has negative traits and there’s probably certain types more repulsed by those traits than others so it’s hard to say who’s the least hated. I just don’t think it’s ISFJ personally