Here's your foot - please put it in your mouth

I went to Babies R Us today. I had to return something and buy a lot of somethings. At the checkout - after my total came to over $100 (not a single toy in my cart of somethings) she says to me "Would you like to donate $1 to Toys for Tots for a child who may not be as fortunate as yours this year?" I replied "No thank you." She then says (while shaking her head) "shame, shame, shame." My quick response - "I have 21 month old triplets at home, toys for tots will be at MY house this year. But thank you for asking." All of a sudden I hear "Good for you!" There was a line of people behind me and one mom had said this...apparently wondering the same thing I was which is where on earth does this lady get off saying that? Usually I'm not very composed in these kinds of situations but I was appalled at her response to my "no thank you". I mean - I was polite and I am in NO WAY responsible for the children of the world who don't have anything. Nor will my lack of a $1 donation make or break these children. For the record - I'm a sucker for donating...but mostly the things that we have that we have been fortunate enough to use for a while. My cart of somethings will be donated to another child that may not have the somethings we have. And to the lady at the register...here's your foot - please put it in your mouth.