I’m totally on board with the idea that for academic anthropology, self-identity should be treated as the core determinant of cultural grouping: i.e., people are who they say they are.

But IMO, to take that academic lens outside a scholarly context and browbeat that there’s no point having a commonplace semiotic label for “common behavioral and stylistic trends of white, working-class British youth from the 90s and aughts” is a weird leap that misunderstands practical semantics.