Yeah, asking someone what they did with the money could seem a little invasive although it's a reasonably standard question, said out of pure curiosity I guess.
At some of the banks here, they will not give people their cash when they try to withdraw it without asking what they will do with it (over certain withdrawal amounts). I find it incredibly invasive and none of their fucken business.
I was asked once, by a female bank teller, and I looked her in the eye and (quite loudly said) prostitutes. She didn't ask any more questions about what I will do with my own money after that.