I would add that I think a general issue is INFPs tend to get close to people by saying “This is how I feel” then waiting for the other to share when the mood strikes them. We feel we are being open by sharing ourselves. This is Fi. Fe users want you to ask about them, acknowledge and understand their emotion even if you disagree, then offer your own input as it relates to theirs. Group harmony. So Fi is seen as selfish by Fe. Fe is seen as intrusive by Fi.
To be stupidly simple, an Fi user might say “I hate tomatoes.” Another Fi user would reply “But I LOVE tomatoes”. And both would chuckle and say “That’s fine, we are different”
An Fe user would prefer you say “What’s your opinion on tomatoes” and if they extolled their virtues would rather you say “I certainly understand all the points you mentioned. Personally I’ve never been the biggest fan but I support your choice.”
To Fe, Fi seems blunt and caustic. To Fi, Fe dances around issues and is unnecessarily concerned with what others think. The other thread mentioned the woman ordering only fries as being selfish. I saw her as being unobtrusive and trying to make the best of a situation she found difficult.