There is no denying that we are all different, many cultures exist around the world. Even within a single culture there are many subcultures, each with many differences in opinion and personality. However, for all the differences we seem to have, if we were to make a list of all of them it would be finite, that is to say there are a limited number of things that you could find different between a group of people.
In contrast, there is a near infinite list of things we can find that are similar, from our physical makeup at the cellular level to our basic human needs. Every person wants to feel safe, to feel like they belong and are respected as a human being. Everyone wants to feel joy and to enjoy their life to the fullest, to understand what it means to be human.