There’s some things you just don’t do when you visit other places. You wouldn’t go around dissing the champagne in France, the pyramids in Egypt, or the Red Sox in Boston. Disrespecting a town or country’s claim to fame is liable to get you glares and maybe even fists from the locals.
And the same thing goes for Japan. Each region is very protective of its local specialties, so much so that they’ve created a Twitter hashtag to show everyone exactly what they should be wary of disrespecting if they visit.