Those expectations can include knowing how to entertain, how to dress the part and fitting in with a truly international community that can be more savvy and experienced. That is not just learning table etiquette but also relates to being a good guest in another country. Identity is at the core of the culture shock of expat living and profoundly affects that expat class system. Where someone fits into expat social circles is very often based on where that person fits into the organisation or company which employs him or her or sent them abroad. Or does not fit, as the case may be.
Nationalities also play a social role.
New expats often find themselves socialising with others from their own countries for no other reason than that they share a flag. They can then find themselves reeling with shock from being with too many fellow countrymen. Griping about local people and customs ironically brings some expats together. For starters, don't think that just because you carry the same passport as someone else you will automatically be friends or indeed have to be friends. Like all forms of culture shock, you must strive for a period of adjustment which means acceptance.