I'm all aboard with being pleasant and respectful of others, but find some aspects of this distasteful. Specifically, the portions of the author's "politeness" that involve performance, or adhering to a script I find off-putting. For example:
"Just ask the other person what they do, and right after they tell you, say: 'Wow. That sounds hard.' "
While it seems that many aspects of "politeness" are intended to trigger pleasant feelings in the other person (which seems harmless enough), I find it hard to be in favor of something so disingenuous. Even when it comes to small talk, I think one can be both respectful and charming without having to fall back on a script and cheapen the interaction.