I would say that the question the salesman asks goes to knowing whether it is a HABIT that Joey has to just nod his head while his friends are having a conversation. ' when he asks his question. Hence the simple present...
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WaïtiI would say that the question the salesman asks goes to knowing whether it is a HABIT that Joey has to just nod his head while his friends are having a conversation. So he implies something like 'do you USUALLY do such a thing ?' when he asks his question. Hence the simple present...I agree: 'habit' is the operative word here.