Odd and creepy

I was walking along the street on my way to going jogging and was going at about the same pace as the letter carrier. As he delivered mail to each house he'd yell out "Idiots". I was across the street and heard him quite clearly. After 2 houses I thought, 'Is he having a psychotic break? He doesn't seem to be talking to anyone except himself, angrily' After the 3rd house, I looked at him and yelled across the street, "What's up?" He said huffed and said "people who don't clear their walks of ice". "oh, yes" I said.

Then continued on my way to end of street, slightly terrified of the mail carrier, mentally reviewing whether our sidewalk was clear. Luckily it is.