Habao or Bao is a relative noun, which means baby and dear. Many times, such a statement will only appear between lovers. If a boy calls you that directly, it is likely that this boy is interested in you to test you. If you have a good impression on him, you will not refuse and will continue to chat with him. After receiving the signal, you can continue to chase.
Of course, if you have a very good relationship with boys and like to joke from time to time, the words "Habao" and "Baby" may also be jokes, which need to be analyzed in combination with specific situations and some usual behaviors. If you don't need to be vague, say don't call them that in the future to avoid misunderstanding.
If a boy calls you Harper or something, it's a bit of a problem most of the time. If you have expressed similar feelings at ordinary times, you may be expressing your own feelings. You need to respond according to your inner thoughts.