Ellis benefits greatly from interpretation by a disinterested third party. American Psycho is a shit book. Not as shit as Rules of Attraction but pretty shit.
If you want a real treat, do Less than Zero. Ellis hates that movie, probably because it has a plot, a protagonist, an antagonist, character development, etc. It also has a set designer who clearly put half the budget through his nose and the other half into neon but there aren't many other movies with both Slayer and Bananarama in the soundtrack.