Eating sushi because it's not local, ie. exotic. Since facebook was introduced it's one of the ways to promote yourself and your supposed extraordinary lifestyle online.
The GP may have been pointing out that many people in China still have hard feelings over WWII atrocities. I have a Japanese friend who pretended to be Korean when she was living in Beijing because of the hostility she experienced. I think the most blatant hostility she experienced was when her cover was blown because her mother (who can only understand Japanese) called while she was in a cab. The cabbie heard my friend speaking Japanese, and because of that pulled over and made my friend get out.
