The meme is about overtime? I must have misread. But yes, courtesy last only as long as your paid for.

spoil /spoil/ intransitive verb

To impair or destroy the value or quality of; ruin.
"spoiled the dish by adding too much salt; spoiled the party by getting into an argument."
To harm the character of (a child) by overindulgence or leniency. synonym: pamper.
Similar: pamper To plunder; despoil. 

The American Heritage® Dictionary of the English Language, 5th Edition • More at Wordnik

Yes, yes, because save save the precious business - hours we must. Let’s not spoil them with some human interaction.

Courtesy?

Courtesy? I mean come on, is it really asked to much to say your name and why you are part of this meeting?