WHY Present Tense?

I have a question about the dialogue in one of Friends' episodes; the salesman asks Joey,

Salesman: "Do your friends ever have a conversation and you just nod along even though you're not really sure what they're talking about?"

My question is why the salesman uses Present Tense instead of Present Perfect. If the salesman was asking Joey his experience in the past, then shouldn't it be Present Perfect instead?

Thanks in advance.

Waïti wrote:

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. 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.