That's not what you said though. You said Biden didn't embarrass us on the world stage. There were plenty of embarrassing moments, to a point he was lampooned in at least Australia and Europe in comedy skits showcasing his sleepiness, poking fun at his speaking mishaps and dementia, etc.
I would not consider the SNL equivalent in Australia or Europe to be "the world stage", if that is your definition of world stage then, sure Biden, Trump, Obama, GWB, Clinton, GHB, and Reagan all embarrassed themselves on the world stage.
People laugh at Boris Johnsons hair, or GWB talking about "fool me once". But, to have world leaders say you can't rely on you for sound economic strategy that is completely different.
I think you mentioned that people care about their pocket books the most, so if you have someone who's flip flopping and can't articulate a sound strategy to the rest of the world while also taking direct aim at them for things that are either made up or not based in reality. That person is embarrassing their country on the world stage.