This was taken from School of Systemic Socionics forum, which IMO is right on the ball:
One way to understand the PoLR of any given type is to figure out what the Leading function of their conflicting type is about. What kind of attitude/orientation does the 1st function of the "conflictor" type have? That's exactly the kind of information/attitude the PoLR person will be oblivious towards.
Thus, to figure out what the Fi PoLR of ESTp is all about consider what EII's Fi does. INFj's Fi comes with a + sign and it highlights the most positive potential in introverted attitudes. This exact thing that the INFjs "hone in" so easily is the same one that the ESTp completely ignores by the virtue of their TIM.
On the example of ENTp and ISFj here is what -Fi PolR looks like:
While the ISFj remembers the slights, misgivings, and grievances in personal attitudes and intentions, the ENTp is wholly not mindful of this and easily forgets this type of information:
Posted by an ILE (link)
"Fi in Dons is 1-dimensional i.e. relations either exist or they don’t. Relations are either very good, sincere, open – or they are reserved, dry, impersonal. There is no middle ground. The transition between the two states is extremely painful, especially from + to -. Therefore it is so important for us to make sure that we are accepted and loved. In order to know in which category to include someone – either as a friend or someone we don’t care about. No, not an enemy – enemies don’t exist in our world. That is not the case in principle, by definition.
There are friends - and acquaintances. Well, and strangers, of course.
We can write off a person as a friend fairly quickly, and as a rule, this rarely changes. I.e. it’s not even that important if we communicate at all, but the person will remain on the “shelf” with the label "friend."
That's why we forgive truly, permanently. For us, an offence is simply moving the person from friend to "simply acquaintances", and forgiveness - to move him back to a friend. Therefore, the past is automatically erased and there is no resentment at all. With a rare exception: when a person is somewhere in between, that is, he’s not really a friend and not quite an acquaintance. Then tension can build up for as long as there is this uncertainty."
(-Fi Polr : ILE "Don Quixote")
Posted by an ESI for contrast (link)
"Regarding rancor and remembering wrongdoings — on one hand, slights I remember forever, but only as a "fact of grievance". On the other, it is not a given that I will resent them and dream about revenge — I can peacefully interact with the offender. I will simply mentally note that he treated me poorly, so either this is a bad person or he is negatively predisposed towards me. Both of these are useful and important for me pieces of information that should not be forgotten.
In this sense, I remember all the bad things, even the minor ones, and for my entire life. Good things I may forget. Because for me this is not as important — if you forget that a person has treated you well, it is less dangerous than forgetting that he or she has treated your poorly, and is capable of all sorts of malicious behavior.
By the way, here's one more thing: I acutely feel poor attitudes — towards myself or between other people. I can see it right away and I am never wrong in this. But when it comes to good relations I orient rather poorly ... Two days ago my boyfriend introduced my girl-friend to his friend. I watched the couple the entire evening, but couldn't discern if his friend liked her or not. There were no signs of negative attitude, that's for sure, but I couldn't estimate the degree of good relations either.
I show a negative attitude towards someone when interacting with them spoils my mood. In such cases, I can forget about the benefits of interaction and about the negative consequences of conflict. If a person drives the me to depression, I cannot hide my antipathy for him."
(−Fi, mental, during uncertainty in Ne : ESI "Dreiser")