Ice – you’ve been living on an island. The historical story has been, the longer an ethnic group has been in the US the more likely they are to marry “out.” In the past, new groups of immigrants were stigmatized, looked down on, and not considered quite good enough. As they go through a few generations, acquire flawless English and get their own quotas of doctors, lawyers and congress reps, they become normalized and considered acceptable. We’ve just gotten to that point on the trajectory. The newer groups are still insular, but as time passes they will be more accepted, move into neighborhoods where they aren’t threatened, and blend in. We need to offer people more than “Don’t marry out, it means that Hitler won!” or “Non-Jews are horrible and Reform/Conservative not much better.” We need to show people the meaning and beauty of Yiddishkeit to create a positive attraction.
BTW, calling people names and ridiculing them doesn’t do much to attract them, as opposed to saying, “We’ve got something great – come and check it out!”