You never know. As we go through our day we never really know what other people are going through. The driver who cuts us off may be on the way to the hospital. The person who glares at us when we talk loud may have just fought with someone they love. Then again, they may just be jerks.
It does not matter, jerks or a bad day; it costs us nothing to give them the benefit of the doubt. They are part of our story for only a moment, but a smile or at the least the lack of our own glare may help make things better for them.
If we can’t let the small slights, the inconvenience of strangers go, all it does is serve to darken our day. We can work to make others' day better or we can reflect there sorrow to the world.