I feel that if you are going to a quick service store (fast foods,etc). You don't necessary need the people working there to be asking you how your day was or nothing of the sort; because like you said you don't care about how that person day went so why should they? All they need to do is ask how they can help you and say thank you at the end. Thats it! I really don't like when people come in a store acting like they are the Jesus of the day, and that without them the place wouldn't be there .
your right and it holds up the line as well making me wish i was armed and dangerous