First, I don't think there is a superior word to use for the occasion of eating together in the evening. (Although the phrase "fourthmeal" should not be one of them, ha ha.)
Yes, the country at large has become far more homogenous, thanks to mass media and television. The United States is so huge, and think about it: in other countries, there are regional accents, traditions, cuisine and crafts which come from varied places inside one single country. I've never been to Europe, but would love to experience the cultural overlaps that have occurred in these countries, being in such close proximity to each other. It seems that I rarely hear a variety of accents on national radio or television from their news anchors or reporters; I'm in Oregon, so I can't speak for the rest of the country, but our local news sounds just as homogenous as the national news.
I think the other problem is that we don't hear about other parts of our country unless something like a natural disaster or other upsetting thing has happened. So we miss experiencing the day-in day-out life of others. Simple things like "do you get dressed up to go to the market?". My friend's daughter visits from Texas, where she's lived for a long time now, and is aghast. "Mother, the store-- everyone looks so depressed. I forgot that people go out in polar fleece, they don't do their hair or makeup. It's like they don't care." I have to laugh. It's true. We don't try overly hard, some of us.
Lastly, I'll say this: I think that there is a cultural disconnect between the north and the south. People are likely to feel that *their* way is better. I was not originally born a northerner: I was born and spent my first years in Honolulu with my mostly Filipino adoptive family. There are a LOT of people who misunderstand pidgin english (which is a language, not a dialect), and some of the ways of the Hawaiians, which are different from our culture here on the continental US. I have heard some very nice, well-meaning people speak of Hawaiians and Hawaii in such an offensive manner, it was very hard for me to hear it. I've even heard the "they should speak English" comment on several occasions. Maybe. Or maybe you should learn to understand a little Pidgin if you are going over there, just like you'd learn a bit of French before visiting Paris.
Stepping down off my soapbox to go make my evening meal.:)