As what I presume to be a INFp Beta I have problems with overly nice people because it is disarming to potential threats or problems. More PC ways of speaking disarm me and manipulate me! See the George Carlin take on PC language, I basically agree....
I have developed a strategy to be a bit of a dick and mess with people to challenge and weed them out because if I don't take an immediate assertive or aggressive position they worm their way in and it backfires....
In my experience the types that I have this issue with tend to be anything but Beta and most typically Delta. Makes sense right? And the closer the temperament matches the more problems I have. For example I have problems with ENFp's/IEE. The EP temperament combined with being too nice and lack of Ti leads to future disaster for me. EII/INFj I have a easier time in keeping at bay due to boring/stable temperament mismatch and more structured views that I see our differences in. Whereas EP IEE gets me interested and rushes into things and leaves me holding the check metaphorically. This is typically magnified with them being an attractive woman (and if they are stupid) because it makes me as a man to be dumber in the early stages. I typically go on 2-4 dates with these types before I realize the glaring problems. Other INFp are usually nice but they also have a harsher judgement side than ENFp's and we get on the same page easier. ENFp's avoid negativity too much and thus don't actually clarify where they stand, leading to later misunderstandings when things actually happen.
Types I see doing this and types I have problems with in my history.
1. ENFp (super nice and the temperament match makes them more of a potential disaster, a seductive poison)
2. INFj (the most nice but also the easier to reject, they like doing unsolicited favors and want to be repaid in kind IME which rubs me the wrong way)
3. ESFj (can be nice but also a complete ass, annoying temperament triggers my "fake/danger" warning quicker)
4. ESFp (like ENFp but their more direct way of interacting triggers my natural Ni more into action, less disaster and more deeper values mismatch)