Different way to use polite expressions

Polite expressions are used to show respect, but did you know there are different ways of using them?

Example 1
Imagine a married couple that usually uses casual expressions with one another. One day, the wife suddenly starts using polite expressions to her husband. This is not because she wants to show respect, but to show that she is angry at him or that there is an emotional gap between them.

Example 2
Mr. A and Mr. B are classmates or co-workers, they are of the same age or are in similar positions. They know it's more natural to use casual expressions but for some reason, Mr.A uses polite expressions to Mr.B. This shows Mr. A doesn't want to be friends with Mr. B.

As we can see with these examples, polite expressions can sometimes be used when you don't want to show intimacy or closeness with a person.