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"
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