For completeness Olivia Vert made it for the Journal of Immaterial Science (also the Barbenheimer one, and some others but I think they only shared those on Reddit)
This thread is like a Reddit/Lemmy Smart Guy combo. People who just assume paid researchers didn't consider this extremely basic thing they learned about in high school, and also hinting at IQ-based eugenics
The lemmy.world thread reminds me of a similar "racism on the fediverse" thread, and the occasional thread about misogyny (dismissive, uninterested and/or personally offended)
I think Sweden already picked that as their insult towards Italy