There are two aspects. First of all, that mother's attitude was definitely wrong. You can't defend that behavior in any way. Besides that, you should not worry a lot about it. My experience is some people assume others want to get something from them by being nice to them. They always consider themselves very special like super stars. They think people trying to be nice with them are dying to get the honor of shaking hands with them. So, they give that honor to only those, whom they need themselves. Now in future, you don't need to create a situation with that proud lady but try to avoid her. Remember in a small town, everyone needs all other people. She will realize that soon.
Besides that, the reality is some people can maintain a standard of life with current income. However, parties and things like that ruin their monthly or weekly budgets. That makes things worst for everyone.