After watching this film twice, I am of the opinion that it really is a satire rather than a horror film. I say this because the majority of the film is really about Patrick Bateman’s pitiful attempt to define himself through his obsession with his model-like appearance, his outlandish purchases (such as two Robert Longo drawings in his living room), music selections, and his choices in nightclubs and restaurants. The man is adrift with no real meaning in his life, and thus this is why he is “psycho”.
He demeans women, seeing them as little more than sex objects or status symbols. He is engaged to a woman (played by Reese Witherspoon) who sees men in the same way he sees women, which is convenient for a while but eventually results in a rupture of the relationship.
He is hyper competitive and overly sensitive to the trappings of success. He becomes especially competitive with a colleague Paul Allen (played by Jared Leto) who has gained recognition that Patrick lacks and seeks.
Early in the film Patrick lapses into psychotic halucinatory behavior, thinking that he is killing the women he picks up and the collegues who out shine him at work. We are given considerable hints throughout the film that his murders are figments of his imagination. I realize that some viewers will not interpret the film in this manner at all, but I suggest they carefully watch the film and seek the clues that Patrick is hallucinating and thus imaging that his desire to kill is in fact overt behaviors rather than impulsive thoughts.
So why is he an American Psycho? Because he is a terrible empty shell of a person, driven to self definition by the American marketplace. The poor fellow had no original opinions. He actually memorizes CD covers as substitutes for developing an original opinion of the pop music that is integrated throughout the film.
And yet, in some ways this really is a horror film, for what could be more horrible that a meaningless existance? The author of the book, Bret Easton Ellis, would let us know that many people experience this horror every day.
The film is actually very good and unfortunately misunderstood and underestimated by most viewers.