This isn't even a meme this is the entire point of the book and the movie, that humans have 2 sides, the public self and the shadow self and that modern society's complete, overbearing demand for the former at all times just makes the latter come out at night or when sufficiently alone, in the form of extremely disordered and degenerate behavior and fantasies. Literally the entire movie is just Patrick dreaming of being a serial killer because his constant need to portray a positive public image at all times is driving him insane.