posted on Mar, 18 2013 @ 07:37 AM
I think this is about how people react to change in social customs.
As far as I know, calling your father "sir" is an American custom, at least in modern times. I've only heard it in American films. In Britain, when
I was young, it was only the teachers who expected it.
Perhaps the custom is beginning to be eroded even in America (as some of the replies in this thread suggest).
In which case this father is probably conscious that things are changing and trying to put up a resistance.
Addressing the older man as "sir" is a battle which was lost in Britain a long time ago.
What is under threat now is the use of "Mr".
When a hospital nurse addresses her patients as "John" or "Jane" instead of "Mr. Smith" or "Mrs. Smith", the older people tend to resent this