Past Myriad on what philosophy is useful for.
The relation between philosophy and culture is similar to that between science and technology. Almost no one needs to do science to live their lives today; you can be, and the vast majority of people are, passive consumers of technology instead.
You can... [likewise] be a passive consumer of the culture (or subculture) you find yourself in....
If, however, you want to criticize or change culture, and want to do so on some basis other than your own arbitrary opinion, you have to practice philosophy. That doesn't necessarily mean originating new philosophical principles; applying an informed preference for some previously established philosophical system, based on knowledge of that system and the available alternatives and what cultures those systems have influenced, will suffice.