"they are united by a belief in the power of decentralization, cryptography, and financial sovereignty"
I personally know bitcoiners who doesn't care about decentralization or cryptography at all. They just want to protect their wealth and would switch back to fiat immediately if fiat would offer stronger assurances and guarantees.
I believe that there's no Bitcoin community or culture as every bitcoiner sees and uses bitcoin for their own reason and motivations.
It would be just as absurd to suggest the existence of a water or air culture or gold community.