> If a Japanese person owns a house in the U.S. and asks me to take off my shoes, maybe I should ignore that since my culture in my country doesn't do that? No, I'm not an asshole and I respect their culture, even if they want to practice it in my country.

But you won't respect their culture in their own country? Double standards indeed.

Wearing your tattoo proudly in Japan is perfectly fine. Just be prepared to be asked to leave an establishment that doesn't tolerate them. It's closer to "No shirt, No shoes, No service" policies in the West if anything.