What is the attitude for the new person?
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Reluctance to greet new people (we do not know) first is common to humans. Especially for those who have a closed attitude and not easily comfortable with the new person.
If you have a complaint like this, one way out is to start greeting, greeted alone. Or with an opening smile from you. A smile from the heart, it can bring our emotional more open to accept the situation and out of the closed attitude.