The film’s problem was casting Brad Pitt as Durden and changing the ending so that he’s successful. The movie made him attractice and charismatic. The book makes it clear the narrator is completely unhinged and fixated on his hatred of women and femininity.
The book is very clearly a story about straight men not being ok. “straight guys would rather punch each other naked Ina basement instead of go to therapy.” The movie doesn’t translate that well, so it reads more like a criticism of 90s work culture. Which is fair, but it often misses what Palahniuk intended.
To also be fair though Palahniuk seems to like the movie, but really despises young straight men admiring Durden as some antihero. He elaborates that feeling in the comic sequels.