How does inferior Fe differ from inferior Fi? Are IxTPs more emotionally demosntrative since their feeling (albeit inferior) is extroverted? I'm trying to understand the thinking types better.
They have more emotional meltdowns under stress because they are aware of others' expectations for them and are resentful about it, yes. Low Fe knows what others "want from me" and can choose to deliver it or not deliver it; therefore some ITPs fake having more emotions than they feel, to keep other people from disrupting them with accusations of them being too cold, detached, uncaring, etc. They are analytically aware of some emotions being "expected" in a situation, and either not having them, or having them intensely, and not knowing what to do with them. Like, a Fe thing would be -- someone you care about dies, you feel sad. That's what it is to be human. If someone dies and you don't feel sad, what does that mean? Is something "wrong" with you?
Fi understands that "I don't feel sad, so... it is what it is." They don't have an expectation of what they or anyone else is going to feel in any given situation, since they figure that out as things happen and they have an internal reaction to it. They also don't know what others expect from them on an emotional level or how to give that to them, since if they don't feel it, it doesn't want to come to the surface and feels insincere. Fi is the same anywhere in the stack in terms of being internal, only with ETJs it's a lot more black and white "I do/don't care about that" than in higher Fi types, who have more emotional flexibility and nuance.
I write about this in my MBTI book, so... yeah. Get it. ;)
Once you get to know ETJs vs ITPs in real life, you start noticing all the little Fi vs Fe indicators in how they talk, how they view humanity, in their sense of being obligated to humanity (or not at all), etc. The "what is best for everyone = what that puts on me" is pretty obvious even in Fe types, whose moralizing tends to echo high Fe types but on a lesser level with more logic entwined in it. Whereas ETJs are just "me" focused; the good they do comes from me, because *I* feel this way, not from external expectations or standards.
