Why do people not mind there own business?

So, once I visited a small electronics shop but well organised, he later became like a friend. I saw something strange and annoying that when people visit, wait for there product to get diagnosed and fixed, some people tend to ask personal questions like how much have you studied?ghar per kaun kaun hai? where do you stay? are u married? are you native here? वडील काय करतात etc I have experienced this myself If I politely deny to answer. समोरच्या चा ego hurt होतो and they sometimes start bad mouthing that I am arrogant etc to satisfy there fragile ego. But, I fail to understand what it takes for anyone to mind there own business? Only have strictly professional relation and not get data for gossips? इतना ego लाते कहा से है? In countries like UK, people don't care who stays in there neighbour and what they do. Why are people so interested in other's personal life in here? End of Rant