People are People

Human beings are not a commodity. We should never view interaction with another human being as something trite and dispensable. Unfortunately, this is something that can't be forced on us, love cannot be legislated. No matter how small or insignificant the encounter may seem, they walk away from it and go back to an entire life. It's not just a person you buy an item from, it's an entire life full of hopes, ideas, beliefs, and experiences. So when you have these flash encounters with people keep in mind what you are actually encountering, then treat it accordingly.