Along the lines of the
EW article: Guinivere Turner, co-screenwriter of (and actress in)
American Psycho, in an interview with Ron Hogan published in
Bitch: Feminist Response to Pop Culture said this:
Warning: Spoiler! (Click to show)"When we wrote the script, we wanted it to be absolutely clear that he is actually killing people...And that's not what people are coming away with. They think it's all a dream, or all a fantasy. I was doing a roundtable discussion with a bunch of journalists, and this guy's first question was, 'So did he do it or didn't he?' And I said he was really doing it, so he turns to the woman next to him and says, 'See?'"
I think it ends up becoming a "Lady or the Tiger" sort of question for many people, regardless of the filmmakers' intentions. After seeing the film I was of the opinion, like some have alluded to, that
Warning: Spoiler! (Click to show)the "I got mine, screw you" culture of the 80s was in essence doing Bateman's clean up work for him and no matter what unspeakable acts he could commit he'd never face any real consequences, much like Robert Chambers in '86.
But I think how you view it depends on what notions you bring to the table, which always makes for interesting discussion when the movie is brought up.