As far as I can tell the message of the movie is "consumerism is bad because it's emasculating and feminizing, real liberation can be found in ruthless hierarchies of masculine violence"
The only person I know who likes it IRL also has a tendency to complain about the "pussification of modern men"
fight club is about toxic masculinity. id link the folding ideas video but it goes into really heavy spoilers so look it up if you wish
I've never seen fight club but I know the plot of fight club at least so far as the main story beats I wouldn't worrry about spoilers that much