I meant subjective as in what you say. All that humans do is to strive to fulfill their own motivations, and communication is just doing so through interaction with other humans. The only reason for that what we say is connected to what we actually experience is that we don’t like people finding out we are misleading them and as a result like us less.
Nobody else can really measure our happiness, though, so there is no concrete motivation to respond to such questions as accurately as possible, so we’re much more inclined to just say what is socially the most favourable.
Like, do you genuinely reply how you are feeling when someone asks you how you’re doing? I’d say most people don’t.