Depends on the person. Some people are busybodies but don't mean any harm, they're just nosy and think they're being friendly. With them, I would avoid a direct answer. Back as a JW, I didn't lie, but I'd deflect the question and not answer it fully.
Now, some people were just obnoxious and rude. I usually avoided them and was pretty good at it. But on the rare circumstances that I got cornered, I pretty much told them it was none of their business.
One elder that was pretty nosy was also a bit pompous. He liked to call other JWs, "my child" or "my brother"...as if he was a priest or sumthin. One day, he's trying to pump some info out of me about something I didn't care to discuss with him. Early in the conversation he called me "my brother" but as I resisted his intrusive questions he called me "my son" at which point I ended the conversation with, "Let's get one thing straight...you are not my father, I am not your son. Do not pretend to be something that you are not and cannot be. Address me by my name or not at all." and I walked away. I'm not usually so blunt but I've learned that with some people you have to beat em over the head for them to get the point. In this guys case, I'm sure it didn't even make a dent, because to this day he still uses those terms when talking down to other JWs.
Interestingly enough, outside of the JW world, I rarely have to deal with busybodies. I know they're out there, but maybe since I can choose my associates instead of just being thrown into a group of people at the KH, I tend to associate with people who I find fits my personality and likes/dislikes better.
