With what?
This isn’t about just eating sushi. It’s about respecting Japanese etiquette. Maybe not when at home or at some generic restaurants. But in a proper Japanese place. Like an actual Japanese place. You have to respect their rules. Or in front of Japanese. It’s seen as disrespectful and insulting to eat sushi incorrectly.
well for one, you can dip the sushi in the soy sauce wrong. You’re supposed to only dip the fish.
You can use too much soy sauce.
You can mix the wasabi with the soy sauce which is wrong.
You can bite the sushi but you’re supposed to eat the whole thing at once.
You can eat the pickles ginger with the sushi which you’re not supposed to do.