Things seen (normal human beings)

I was in a  local shopping centre recently and as I was coming up the escalator this woman called down to her husband or boy friend hurrying him along to something she wanted him to be with her on. She urged him to keep up with her "like normal human beings" - this as she and her partner literally ran through the centre. "Normal human beings" are not a common reference point for me as they are for some but I did wonder if her language was justified.