"It is none of your business!" A dustman repeated again and again.

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Firstly, I don't know what happened to that person that makes him to repeat the same sentence---It is none of your business. Sometimes, I cann't stand for it, you know, he always say it in the early morning while we are sleeping. One day, I heard that sentence closely, and quickly looking for that person,oh,my god, he is a dustman, there he stays alone, but who is he talking with,I stare at him for a long time, he still kept a smile face, and repeated that sentence again and again.I am confused. Maybe he was hurted which is related to this sentence, who knows?