Polite does NOT mean you follow a rule no matter what.
For example, in the presence of people who eat fried chicken with their hands, you don't ask for and use a fork because "polite people eat with a fork, not with their hands."
If a group of people are introduced by first names, you don't insist on calling everyone Mr. X or Miss Y because "polite people don't use first names until asked."
In other words, polite means you follow the acceptable practices of the group you're with. You don't insist on doing it "the polite way."
Why am I ranting about this on a lovely Sunday morning?
Cause I'm getting replies to my form emails that say "I know you said no reply needed but I want to be polite."
It's ok to not reply if I say specifically please don't.
Please believe me when I tell you I don't expect a reply, even a thank you, for a form rejection. That's the ONLY place I put "no reply needed."
(of course, the people who read this blog aren't the ones doing this, so once again, I'm howling at the wrong wolves!)