I know I am gonna get crap for going into this topic, but I noticed that Fe types will assume how people feel based on what we see and history. I see this within myself, within my wife, etc. Its the basis behind wanting to monitor and take control of a situation in regards to feelings. How can you be a feeling police and act pre-emptively without assuming how others are feeling. While this may or may not be Fe, its something I noticed within Fe types.
On a personal level I use this assumption to back down and judge when things have gone to far, how to step in, when to step in, etc. I watch people and what things they respond to and I "assume" how they feel based on what I see or percieve.
I see this in INTPs also. They look at the detail, like if you change around someone they pick up on the details of what you do and assume how you feel by relating these things together. Like if you tend to text all the time around people and around this one person you avoid texts to pay attention to them you start to make assumptions on how the person feels about this other person.
edit: I am Fe so I am analyzing myself and not just bashing Fe people.
edit again: I think the key to assuming is that we respond based on this assumption and its not always something we let out, but it is what we internally believe unless we see otherwise.