RS likes to remind us to do as the Romans do and have tea in England, wine in Italy, beer in Germany, and late dining in Spain.
Food customs are deeply ingrained and ripe for reconsideration and comparison for a broadened perspective, and here comes a New York Times article that explains why Europeans don't refrigerate eggs:
https://www.nytimes.com/2017/02/13/insider/why-do-americans-refrigerate-their-eggs.html
It's worse than that -- if you don't wash eggs, then you don't need to refrigerate them. Who knew?
Dirty warm eggs make for better batters and sauces, too.
This reminds me of a neighbor of my mom who kept a butter dish on the kitchen table,
instead of in the butter compartment of the fridge where my mom was certain it belonged (as the good Lord intended),
leading my mom to be sure that this neighbor was obviously slovenly, and probably morally suspect as well... :P
What are some other obvious sins that you have noticed in your travel that the poor benighted Old World peoples were committing?