The word dude (or the now-archaic term greenhorn) indicates an individual unfamiliar with cowboy culture, especially one who is trying to pretend otherwise.
For instance, mystery shoppers at a restaurant may pretend they are lactose-intolerant, or a clothing store mystery shopper could inquire about gift wrapping services.
Others pretend to have purchased a right of residence and tyranny; but surely the insolence of such bargains is more offensive than the avowed and open dominion of force.