Who to and why does Hazel sometimes have to apologise?

From the text:

Or sometimes if you don’t watch him he’ll dash across traffic to the island in the middle of Broadway and give the pigeons a fit. Then I have to go behind him apologizing to all the old people sitting around trying to get some sun and getting all upset with the pigeons fluttering around them, scattering their newspapers and upsetting the waxpaper lunches in their laps.