Perhaps I'm misunderstanding culture, so please -- to anyone better versed, chime in -- but isn't culture more than physical contributions -- like art, music, and language? Isn't it about shared experience too?
When a black mother has to tell her black children about how to behave in the presence of law enforcement, is that not a cultural experience, unique to that community?
When a queer person coaches another queer person on how to navigate coming out to their family and friends and what challenges that may or may not present is that not a cultural experience, unique to that community?
When a mutant child's powers manifest and they inadvertently cause harm or damage to their environment, which then leads to their being feared/hunted, is that not a cultural experience, unique to that community?
I feel strongly that there IS a mutant culutre, and that its more than fashion, recipes, or residence.