I'm not exactly sure what you mean by "insider vs. outside ideology", and by "cultural themes being stressed in social situations". Like everywhere, there certainly are some people in Germany who like to show off and sort of want to impress you with how educated they are, but that depends of course on the person. In everyday social situations, you rarely talk about "cultural themes". OTOH, if, say, I'm with a friend, and this friend knows I'm interested in literature, she could recommend some book to me she read recently. Or tell me about some interesting concert she went to. Or whatever.
I'm don't know if this answers your question. Maybe you could add some more details?