''Hullo, how are you?''
''Hullo'' is an acceptable form of greeting, but I'm not so sure about ''how are you?'' This is why:
1. There are two answers to that question: ''I'm fine, how are you?'' This leads to another, ''yes, I'm fine thanks,'' or similar variations of that answer. But what if you're not feeling ''fine'' - whatever that means? Does fine mean adequate? So so? Neither good nor bad? Does it have any bearing on the day itself? Does the weather affect your disposition for the day? In which case, whatever ''fine'' means, if you're not ''fine,'' then the social graces apt to this interaction are riddled with small talk, a lot of yeses and lies. In which case, what is the point in asking the question? Or dignifying it with an answer?
2. So, what if you said how you really felt? Well, two things to say about that. One, are you really confident in the other person's actual interest in your well being? Do you feel comfortable in telling them, of all people, how you really feel? And two, is not telling that person how you really feel a complete waste of your (and for that matter, their) time? Is it socially acceptable to go into a long discourse about what you feel, how you feel about what you feel, and so on?
Such social graces as these are completely incomprehensible to me. What is the point in asking someone how they ''are'' if you have no actual interest in the truth and are not prepared to listen to them? Apropos, asking people about their health and well being is a complete waste of breath.