I read thru the posts and only 1 person came close to explaining the problem. Sushi is a craze, not a normal food. Its raw and disgusting and decent people stay away from it but like all Aveiros the Yetzer Hara makes it look appealing.
That’s why its eaten with chopsticks; for the ‘experience’ not the taste.
The Jews were redeemed from Egypt because they did not change their unique names, tongue, and clothing. We have unique foods as well. See Shulchan Aruch Hilchos Shabbos about ‘Pashtida’ which is a type of Kugel and the commentaries on its significance.
To summarize: Sushi isn’t just a food, it’s a way of feeling Goyish.
P.S.maybe if we Yidden would stop idolizing the Japanese culture we wouldn’t have had problems in Japan with the 3 bochurim