
its not "what movie do you think is the best" "which is the closest to perfection" "what do you think achieved the most" its "what do you enjoy the most" what could you sit down, no matter what the mood or time, watch and come out saying: "i really enjoyed that movie and watching it. it really resonated with me and made me feel fulfilled"
i might not be articulating the second part super well, but the point is: i could not sit down and watch shawshank or interstellar or mr robot (tv but same point) at any time and feel content during and after. its true that after watching them i might say "that was a perfect movie" but perfection isnt usually what truly draws a persons true favoritism.
as much as i believe this is a joke, for me to say so would technically be the last point which i made. like its an horridly poorly rated movie, which iirc i didnt like at all myself - but the point of the social pressure thing is that i believe oftentimes people end up believing something which isnt truly their favorite movie (or thing in general) to be their favorite because it receives the least shame
i hear "venom 3 is my comfort movie" and i might scoff because i see it has abysmal reviews, i might go back and say "that terrible movie is your favorite? look at how much is wrong with it! its so bad, so completely thoroughly flawed!" which is putting you down because your taste in movies (things in general) seems weird/bad to me. your preference is "flawed" "inferior" "subpar" -- even if these are said by many people, its entirely subjective.
so psychologically and socially, after hearing that, youre inclined to hide your favorite movie when asked, instead saying "the dark knight" - and after a while it becomes semi-true. you geniunely might believe your favorite isnt morbius or venom 3 or whatever, but the dark knight, even if you dont enjoy them remotely as much.