In my humble opinion, the very fact that those celebrities are working, however menial the job might be, makes me respect them even more. 

You have Hollywood actors who are spewing hate, exposing their private parts and empty head, neglecting their children, etc. etc.  You have Bollywood actors who are running with their vehicles over homeless people sleeping on the street, cohorting with mafia, etc.  Compared to those, our actors are saints.

You might deride them for selling sandwiches, cleaning motel rooms, shelving produce in grocery store.  You probably feel slighted, dissappointed, even disgusted to see them in those positions.  But imagine, how hurt they would feel everytime they meet folks like you with your ever judgemental and deriding eyes.  Why should they feel bad or inferior just because they have chosen to work?

So c'mon.  Sure, it is ok if you are just curious about where they are and what they are doing.  But don't go around making fun of them.  I am certain you are better than that.