I have the same doubt. If someone asks "how are you?" but is not interested in knowing your current mood/health status, then why not just say "hi"? And why can't I say that I'm not feeling well if this is true? Not that I will tell my life story, I just would like to say "not really, my cat has just died". What's wrong with that? Life's too short to waste so much time and effort with these useless social clichés.
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"What exactly is a dream, and what exactly is a joke?"