Observe your surroundings, some things may surprise you. But most of all the things we learn help us better ourselves and develop understanding of people.
This is purely my views on certain things to an extent and you don't need to agree. I have formed this opinions from simply observing the public whenever I go out. I am no scientist I cannot prove these theories but a lot have facts and statistics backing my point that I have intentionally left out but please feel free to look into this.