It annoys when me non-Chinese / Korean / Japanese comment on the inter-relations between them and get it completely wrong. It's not a big brotherhood and it's not hate in all directions, either, and it will also vary between individuals of course.
I guess it depends where the individuals are and what's the group they associate themselves with. It reminds me the former Soviet bloc: we have great big problems between ourselves and even greater with Russians, like, never-ending heated discussions about who did whom historically. But then we go West and suddenly everybody’s happy to communicate in Russian, read Russian newspapers, and feel like one big brotherhood