Shortening the proverbial communication distance is a symptom of great sympathy for people and a sign of a lot of trust. However, not everyone wants to build relationships so freely. For many, it is a risky and slow process, but it results in quite lasting and deep relationships. For such a person, there is no reason to immediately switch to informal greetings, show each other pictures of your family and share funny stories about your dog. Once you understand this, it will be easier for you to accept that there are people who demand more formal communication and have a need to create some distance.
Not everyone fits the same shoe size and not everyone likes chicken soup. If you care about good, empathic communication that respects the diversity of needs and preferences, you will surely understand this. Perhaps you will also appreciate a tool that helps you behave this way effortlessly.