The reason you were less scared than your INFP friend, from an MBTI point of view, were probably a lesser sense of empathy toward the characters getting gored and your unwillingness or inability to immerse yourself in that particular film.
Whenever I watch a film, I consciously try to immerse myself in it (by minimizing sensory distractions etc) so I can enjoy it better. Of course if the movie is of shit quality then all hope is lost. The relative lack of empathy can still be an issue, eg "Fuck that guy. What a loser. Glad he got owned", but then again, that's probably related to the quality of the film, such as poor character development.
The film that has persistently creeped me out was John Carpenters The Thing. Its a great horror film, and I also suspect that the director is also an INTJ, which probably helps on some level since there's a good chance people of the same type share sentiments on what is "unsettling"
Well, I can' t say I' m unemotional or unwilling to immerse myself, I just prefer to keep my emotions under control. And when immersing myself, I prefer putting myself only into the place where it happens, not directly into the character' s shoes( though I can do that aw well). I' m there, but I' m still a different person than the main character. That' s what probably helps. I can still preserve the self - control I have in the real life.
I watch documentaries and don't like entertainment designed to thrill or over stimulate with violence or gore. It disgusts me that humanity has nothing better to do with it's creative abilities than depict human's being dismembered. It disturbs me a little that this is what most people consider entertainment.
Perhaps you people got it wrong. I don' t like gore, and I don' t consider it necessary for a good movie. I just don' t get scared of it as much as others. The reason I watch thrillers is because there is some mental challenge in them, not like romance flicks, which are all about kissing, dating and other feely - fluffy stuff, and no logic. In fact, I can be rather compassionate sometimes. For example, I recently watched Carrie, a movie based on Stephen King novel. I didn' t get scared of Carrie, even though killing people is a crime. In fact, I pitied her more. All her life she was harrassed by the bratty classmates in her school. Her mother was a crazy religious fanatic who abused her, and what made it even worse is that Carrie couldn' t just plain hate her mother. She was scared of her, but at the same time she loved her, no matter how much pain her mother caused to her. What happened at the prom was the last straw for her, which made her hate her world. After that, the only person left with her was her mother, but her mother hated her as well. So I don' t think of Carrie as a villain, more like a victim of this world. And I really pity her.
I imagine your like of psychological intrigue has somewhat to do with your 1w9. As a non socially orientated person I myself don't find studies in humanity fascinating. Studies in engineering yes, humanity no. What do I fear? Other people mostly. That would be my w6 talking.
I'm sort of an INTx even though my mbti says INTP, so I think this may allow me to put forward my analysis.
I think most of our fears come from sources that would seem plausible, unlike in scary movies like Paranormal Activity and whatnot. A ghost jump-scaring the audience would be scary, but nowhere near the psychological fright of say an actual serial killer slowly cutting his victims in front of the camera whispering weird shit. For NTs especially, I think we completely dismiss irrational fears such as ghosts and demons, yet we consequently experience the terror of something that is actually possible, such as your friendly neighborhood serial killer.
Me personally, I'm pretty much immune to all jump-scares (not a trait, but actually a developed skill, probably from playing Dead Space on the highest difficulty all the way through) and most frightening material now.
The only true phobia I have is the intense fear of falling (not the fear of heights, but the act of falling itself) which is actually considered to be a rational fear by psychologists. Because of the intensity of the phobia, I strongly detest roller-coasters because of the falling effect it simulates.