This was like the neighbour whose snow I used to clear from their sidewalk if I had time. She got all pissed because I did not do it one time as I was running late in the AM. She came over and yelled at me for not doing their sidewalk. (I used a backpack blower - made short work of the snow where we live) When I said I did it as a courtesy she said since I did it more than once it meant I had agreed to always do it. I shut the door on her. And, from then on, made of point of not doing hers but rather the neighbour on the other side of her. And made sure to walk back and forth extra times on her sidewalk to tamp the snow down. Found out she called the police (she was a paramedic with the city) to complain and wanted me charged with something for not doing her walk anymore. Needless to say they did not come out and charge me. But maybe I should have also asked to walk her dogs. She had three.