Utilitarians are generally classified as realists about ethics, while subjectivists are generally classified as non-realists about ethics, even though both make ethical claims reducible to psychological claims.
That’s because utilitarians make normative claims and subjectivists (of the kind you’re probably thinking of) don’t.
That’s because utilitarians make normative claims and subjectivists (of the kind you’re probably thinking of) don’t.