The key takeaway of the film, to me, is its subtle offhand remark of American yuppie culture; the tasteful thickness of the way they jab (okay I'll stop) at how everyone is trying to be like everyone else - "trying to fit in," in Bateman's words - that everyone mistakes someone for another and someone like Patrick Bateman can get away with murder.

The whole film is about him needing to fit in but at the same time stand out.

The film toys with the idea of [spoiler]the murder scenes being an imagination that all happened in Bateman's head, but I say the line is only drawn when the things get more ridiculous. It's even earlier than the one they displayed in the third act - when the ATM shows the message to feed it a cat - but when Bateman started hanging out in Paul Allen's apartment. An investigation was going on: why would Bateman intentionally spread their fingerprints all around?[/spoiler] Partly perhaps he did want to get caught - the desire to find out who he really is beneath the mundane sameness of corporate life - as the conversation with the lawyer suggested. Partly, however, is [spoiler]his active imagination playing bigger and bigger role as he descended into madness in this third act, as you can see that right after that scene we get the ATM scene and the car explosion scene where even Bateman himself couldn't believe it just happened.[/spoiler]

The director did admit that the ending give viewers a wrong impression of what really happened in the course of the film - so I'm basing my comments on that. The surreal last act seems to be ambiguous, but when you consider the change of demeanor from the realtor in Paul Allen's apartment (and the all-white, recently painted rooms) and the lawyer Bateman talked to, that should be telling of the point of the third act. The eerie interaction, tense acting, and the music really made the last act as the best of the film.

Even when the film is intended as a commentary of 1980s hedonistic yuppie culture, I can still see it being relevant today. The consumerist, "getting into the fad" corporatist culture endures even into the culture of Silicon Valley workers. Patrick Bateman is a that obnoxious guy who really likes to hear himself talk - the kind of Twitter people and YouTube video essayists with celebrity syndrome - and the whole Pierce & Pierce young executives competing against each other to sound smart and look posh are just your typical tech workers taking a jab at politics. Their understanding of the events are just skin deep, but they want to look like the best among themselves. This is why the film is great even in 2022 and I think it will stay great at least in the next 10 years.