In my experience, I think NTs have the strongest, most powerful emotions. Their emotions lie deep within the surface level of feeling- and I think certain events affect them on a deep level but possess great filtering perceptions so do not get bothered by "trivialities" which tends to irritate NFs.
By trivialities, I mean- superficial interactions- little things that I think a lot of Feelers see as "slights" and write long rants about, do not really concern the NT- mindset. NTs, however, when they are angry or mad, wow! I don't want to be there! I tend to stay out of their path- and let it calm down after awhile.
When Feelers get angry, I think they're cute.
They let it out, and then want a big hug afterwards and just sort of melt when they think their feelings are understood and accepted. For Feelers, I find that they want their emotional states to be validated- if they are complaining or whingeing about their lives/work/people, they don't want an NT to come and logically assess their situation- they simply want someone to say "You're right- That's terrible!" Whereas, I think when Feelers try to overly emote to NTs during their bad moments- NTs feel as if they are being condescended towards- they just want the straightforward approach- to say "hey, you sort of acted out of line there, Matt, it caused this-and-this reaction- and I suggest you do this-and-this" as opposed to the Feeler approach "It's OK to be angry, I feel your pain" etc. I think this is why Feelers tend to feel "rejected" by NTs when they don't emote the way they emote to others. It is not a rejection at all, but simply how NTs like to assess interaction.
As I mentioned before, NTs I think have a depth of emotion that is similar to STs (shameless self-promotion here
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Feelers however often mistake "politeness" as a sign of internal values that reflect friendship and caring- when NTs view "politeness" as a typical way of interaction with others. It's very similar to when a random lady smiles at you on the street- "Is she flirting or being polite?"
The answer is: if she is not an NT- she IS probably flirting. However, if she is an NT- then most likely, she is being her usual cheery self.