I guess I'm the only one who feels bad for the old man. He was just walking in his home, not bothering anyone, and suddenly he's bleeding. He probably feels pretty vulnerable anytime he goes out, because of the way he walks. And if that scratch becomes infected, it could be a serious problem for an elderly person.
Since there was a delay in his calling animal control, it's quite possible that it was someone else's idea, like maybe an adult child or other caretaker. Maybe they were trying to document what happened through official channels, in case it becomes more serious.
You tried to control your dog. But a person was injured. That doesn't mean he deserves to be called names by people who don't know him or his situation.

