I can't stand fake nice people. I'd much rather a cashier or a waitress/waiter not pretend to care about how I am or try making much small talk. A short exchange that pertains to their job, sure. Past that, if I don't know you I generally don't care to be overly friendly for the sake of being nice. If I don't know you and you make a comment more thought provoking than something about the weather, sure I'll answer and not have an issue having a conversation. I'm generally not someone that enjoys small talk.