Ace,
I have just read your post and was a bit bemused. Your comment reminded me, as with most parents I am sure, of our offspring when very young, and with sulking pouted lips asking
'why do I have to address them as Sir and no one else does?'
And like most parents I said
'when you grow up, you can'.
The other reason could be 'pecking order', more defference being required from those closer to the bottom of the pond.
Not trying to be offensive here, only commenting on observations.