C'est Bonjour!

I read in my book Culture Shock (highly recommended) that it is imperative to speak to the shop keeper when you enter a store in France. Today I went to La Pharamcie (to get that darned toothpaste) and le monseuir did not hear me say "Bonjour!" because of the morning traffic outside. He was clearly irritated and with a sarcastic voice and eyebrows raised he leaned toward me and said "bon. jour." haha.