American Psycho ending explained: Was it in Patrick Bateman's head?

Breaking down the ending to Mary Harron's American Psycho movie adaptation from 2000, starring Christian Bale.
Breaking down what was real and what wasn't in the Christian Bale movie.

American Psycho by Mary Harron

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I saw Bateman as kind of a buffoon” – Mary Harron on American Psycho

American Psycho' Ending, Explained: Do We Know What Really Happened?

In American Psycho (2000) Patrick Bateman claims he is quoting Ed Gein, when it was actually Edmund Kemper who said this. : r/MovieDetails

American Psycho Business Card Scene — Complete Breakdown

American Psycho — What It All Meant, by Luke Bradley

American Psycho Ending Explained: What Really Happened?