Just looking at the computer that I'm using right now, I see that it's made in China. Of course that means that a couple of years ago, someone went to work in China and worked on putting together this exact computer that I have now--and it's surely the result of the work of several people in the same factory, each putting in their own pieces on an assembly line. And not only that, but the different pieces that make up the computer--the screen, the processor, the battery, the hard drive, etc.--came from a completely different place and were put together by completely different people. And all of those things were made from different raw materials that were mined or produced in different places. I could probably trace the elements of this computer to hundreds, if not thousands of people who worked on it or who provided materials used in it, all over the world.
And so is everyone else! All these people around us every day are here on this planet with us, at the same time as us. What does this mean? For one thing, if we can keep in mind that we're all sharing this planet for a very short period of time, it may be easier for us to see everyone else as "fellow passengers to the grave," as Dickens referred to us all, rather than strangers who may or may not be nice to us. We're all experiencing what it means to be human beings at the same time, often in the same places. If we can truly understand this connection, it may make it easier for us to treat those other people kindly, with decency and respect, and not let them hurt our feelings with their mistakes or their indifference. We're all learning lessons about life as we go, and not everyone learns as quickly as everyone else. Perhaps that person who just was rude to you is acting out insecurities in the only ways they've been taught to do so, no matter how inappropriate or harmful those ways are.
We're in this together. Do we want to be that small portion of glue that holds things together, or do we want to contribute to the separation of the world? Everyone can use a kind word or two each day, and who's to give those words to them, if not us?