On the Big Bang Theory, Sheldon and Leonard have The Roommate Agreement.
One of the rules is The Manners Rule, in which Sheldon states:
At least once a day, I ask how you are, even though I simply don’t care.
There’s a lot to be said for just asking, just as a matter of course, and looking interested in the answer to the question, even if the answer is longer than, “Fine, thanks. You?”
It’s free to ask, and it’s free to listen and it greases the wheels of society a little bit.