Apple_in_my_Eye wrote:
. I tell him I'm disabled and money is very tight. - - -
.
It's none of his business that you're disabled.
It's none of his business that money is tight.
Since you gave him two pieces of personal information he isn't entitled to, it was only natural he assumed he was entitled to a third piece of information too.
Rule 1) Don't listen to any spiel. Cut them off in the middle. Say, "I'm not interested".
Rule 2) Don't explain. It is none of their business why. When you start to explain why (which you did) it just makes them want more details.