yestserday, and thursday for that matter, i tried to keep a mental record of how many people politely asked "how are you?" after i had asked them first. the results were depressing.
for example, a polite, albeit insincere, converstation may go something like this:
"hello! How are you today?"
"I'm great. How are you?"
"I'm doing well, thank you. Did you find everything ok today?"
"I did! this spinich dip is fabulous..."
you get the idea.
However, more than 50% of the people that came through my line didnt return any polite conversation at all. It was more like this:
"Hi, how are you today?"
With which the coversation ends and as I bag their groceries in silence, with a twinge of irritation at their obvious rudeness, I pinch their bread and put heavy things on top of their tomatoes.
Even if you dont like me, think I look weird, or are having a shitty day, at least play the public image politics and be nice to the person who is working on a Saturday to serve you.