[makeitsuckless]

Although not as extreme as in this example, the American custom of saying "thank you" and "please" all the time is considered excessive to the point of being insultingly trite by many cultures.

And I regularly hear Americans complain about people from other cultures being impolite because they don't say "thank you" or "please" all the time.

AFAIK in most cultures these kind of phrases are generally more formal and tend to signal a certain distance that in the wrong context can be interpreted as condescending.