Hi,
Please do not get frustrated and keep patience. I can fully understand your situation and would say that it is just a different kind of mentality. That person is there just spend time and not for any help to anyone. If he can, he would like to just stay back home or drive his landcruiser around with a nice momile in his hand.
It's the expacts who are to serve and work to earn but these guys do not know what is called earning.
In this kind of situation just leave for a while and try your luck later with some other person on the counter.