Oh, absolutely. Respect flows both ways once someone offers it. Although I have to admit, at my age, I sometimes have a hard time saying "Sir" to someone young enough to be my grandson d;^)
Usually, they call me sir! That's because I have a blue hull, Norfolk as a hailing port, a "military" length haircut etc. On the radio I answer in military "alpha tango" speak. By the time they board, we're already pals, usually.