What?! The movie couldn’t be more about masculinity and how it’s warped into a dangerous philosophy. It pretty much predicted incels before there was a name for them. The narrator creates Tyler as his ideal image of the “alpha” male who is successful but still gives the middlefinger to the establishment and who of course is irresistable to women who Tyler only sees as pretty pieces of meat to fuck. He’s who Andrew Tate wishes to be.
But Tyler is actually pathetic. He has his soap business but lives in squalor (which of course he tries to sell as freedom) Sure, he manages to create the Fight Club, but only by preying on other men desperate for a meaning in their empty, sad lives. And he couldn’t have created any of this without the narrator’s money from the settlement too. Which again is shown as this great triumph (because we see everything from the narrator’s eyes), but it’s objectively fully blown psychotic behaviour. The job might have been shitty but I also don’t think we see him ever socialize with his co-workers. He was probably the smelly, weird colleague that everyone was glad to see leave the company.
And until “Project Mayham”'s last act of full-blown terrorism, their pranks objectively would only make them look like assholes too. (it’s full on “just a prank, bro” behaviour). That’s also what Marla explicitedly calls Tyler, an asshole. She’s not attracted to him but the narrator.
The movie’s happy end is not the buildings blowing up, it’s the narrator killing this toxic part of himself and finally stop being alone and unloved.
(By the way, it’s deeply ironic that he simply doesn’t get that the self-help groups just give him a feeling of empathetic community that is completely missing from his life. Which is what the Fight Club is, as well, but there it’s twisted into the old “men would rather hit each other than talk about feelings” bullshit. Again, toxic masculinity.)
It’s also a scathing satire of consumerism, of course. That movie has several layers, that’s why it’s so good.
Sorry for the rambling rant.
TL, DR: The movie is told from the perspective of a deeply delusional man, but objectively he is a pathetic loner who randomly turns into a megalomanical asshole. It literally shows how toxic masculinity can warp your perception of reality and how this “philosophy” can radicalize men following it.