Lines like this illustrate Moore's predilection for the zinger, the heavily ironised pun. A frequent criticism of her work is that she is sometimes too fond of her own jokes, and becomes too clever-clever. But sarcasm is the resort of the weak, and Moore's characters use it in precisely that defeated spirit. Get a Job, she shouted silently to God. Get a real Job.
Jokes are the inadequate weapons of the over-matched combatant.
That line comes from one of Moore's most affecting stories, 'Real Estate', in which, as in 'People like that Are the Only People Here', such lightness is laid on top of a far weightier and bleaker theme.