I run into people weird too and I make a game out of it. When they seem to overstep with questions I start making things up.
I act weirder then they do, you can see it in their eyes how they think how can I get away from her. My DD told one nosy person who wanted to know why she wore jewelry when people didn't have money to buy food, that all her jewelry was found at the dump that she goes too every week and spends all day searching for stuff. She told the woman to have all the people she knew that needed money to go search in the dump for diamond jewelry. LOL