[samfoo]

(I should stress that this might be different for other Americans -- it's a big place with lots of regions)

When interacting with authority figures I am generally polite without deference.

I find that people generally use honorifics when they're being quite rude and would like to soften the impact (e.g. the perennial "Good day, sir"), or while insipidly attempting to endear oneself to another (e.g. perceiving someone as wealthy or powerful). I don't know if it's my own egalitarian nature, or cultural, but I find both more rude than the omission of "sir" or "madam".