They don't ask, if the conversation wanders to work / income, then I always say the same, that I work in a car park and proudly say I am in charge of the pay and display machines, it fails to impress, but it stops them trying to rinse me for cash / loans, or asking me for favours, if you're a plumber they want boiler sorting, IT and they want their Laptop sorting, but car park worker kills all that shit, and they don't want to talk about it as it's so boring, and if they do I explain how we had a nightmare changing over to the new £ coin
Note
Feel free to use the above if needed, lets convince them that most punters work in car parks