Muslim and Hindu communities in the West are also trying to be insular and maintain their own cultural identities, but I guess they're not so effective because they don't have the financial success backing them up that the Jews have. It's a lot harder to deride someone when you know they're making way more money than you, I suppose.
those people are up to something
I don't mean this in any negative way, but they ARE up to something. This something is maintaining their levels of privilege. Is this wrong? I don't know. Probably not, I guess.
I come from an upper caste family in India and it's easy for me to see that this is game that we in India have been playing since independence. There's a lot of cultural and economic know-how that helps people succeed in life, and upper caste families have an abundance of this.
On the one hand, these folks succeed only because they ace the admission tests, have extraordinary academic records and are excellent communicators. On the other hand, the reason they have these qualities is because they were born with privilege. Is this wrong? Unfair? I really don't know. I can't help thinking it's the same situation as the Jews, though.