Once you figure out that the United States of America has no inherent "national dignity," this all becomes a lot easier to take.
The concept of "national dignity" derives from an era in which all countries were monarchies. So an insult to an officer in the Royal Navy was an insult to His Majesty. And since His Majesty derived from his sovereignty over the nation, His Majesty's dignity was coterminous with the concept of national dignity.
Somehow in the late 19th and early 20th Centuries that concept made the leap from monarchies to constitutional monarchies and republics. French national dignity was supposedly insulted by Wilhelm's treatment of the French envoy at Spa, causing France disastrously to declare war in 1870. British national dignity--famously wrapped up in "a scrap of paper"--required it to declare war in 1914 after Prussia violated Belgian sovereignty.
But here's the thing: a nation has no inherent dignity. We're proving that today. There's nothing particularly dignified about the United States, its government, or its people. Insult the United States or its head of state, and should I really give a shit? No--I'd probably agree.
Look--real talk here: this is a country peopled by a stupid and wicked populace. It is a country founded and fostered on conquest, murder, and slavery. It has no "dignity;" it never did. And once you realize that simple fact, this whole thing loses its seriousness and just becomes a bit funny.