I'm all for chatting with passengers and talking to them in the galley and answering any questions that they have etc, as our job says, except if i am on my break or trying to have 10 minutes to myself to eat something etc, i expect passengers to be courteous enough to respect that we need to have atleast 10 minutes where we don't have to talk to passengers. If they do however decide to stand and talk to you while you are eating, i think its quite rude on their behalf. Although, i probably wouldn't have the guts to ask them to return to their seat cos i'm eating as i've heard some other crew do.
Its all common sense really.
Oz