I like consumer in this context because commodification and consumption are how people achieve this false solidarity with billionaires, as well as being a ground for exploitation. Even notions of personal identity are achieved through consumption of the associated products (and displaying you consume them).

Citizen is just a subject of a state, the entire class structure is composed of citizens of different positions in the political economy with competing interests. The worker and employer are both citizens but the relationship between them isn’t captured by that term.