What is propriety and decorum?
Simply so, what was meant by propriety and decorum?
Decorum noun – Socially acceptable behavior. Usage example: high standards of decorum are usually required when attending the opera. Propriety is a synonym for decorum in usual topic. In some cases you can use "Propriety" instead a noun "Decorum", when it comes to topics like etiquette, gentry, good manners.
In this regard, what is an example of decorum?
decorum. Decorum is defined as appropriate, polite behavior in society. An example of decorum is to show good table manners.
"To have a sense of propriety" = to have an understanding of how good manners work, especially with reference to "the proper/socially correct way of doing things". Your example does not show a lack of manners or lack of good social behaviour.