personal contact

What's happened to politeness in our society?  Was at a gas station this morning, and one of the employees was just a few feet away from me cleaning something but wouldn't look up or acknowledge me.  I kept looking at him, ready to say "Hi," "good morning," "great weather this morning," "gonna be a  hot one today".  Anything pleasant and friendly.  But he never looked at me.  It felt so awkward.  It bothered me more than it should.  Do I ignore people when I'm in a different mood?