There certainly are regional differences but compared to Europe, for example, the United States is remarkably homogenous. It's not really a "rich tapestry of culture" - the way people live, think & speak has been very much molded by mass media so that everybody is watching the same movies & TV shows, listening to the same music, staying in the same motels, going to the same chain restaurants & eating the same food.
With the people I've associated with and seeing a good chunk of diversity all through schooling, I don't agree with that, fully. That, however, can just probably boil down to my location, though.
Me specifically though(not really using it as an example), I'll definitely watch the some of the same blockbuster movies that come around, but I also do very much dabble in a lot of foreign movies, especially of Asian decent. My music taste is kind of all over the place, only one I don't care for is modern country - My grandma raised me though so I've liked what she used to play when I was younger, I just can't recall exactly what it was. While I own a television, I don't have any sort of TV subscription, so I'm out on that one. As for hotels, I tend to stay away from the most popular because they also tend to be the most expensive, I prefer the smaller, a bit run-down, hotels. They really aren't as bad as they seem sometimes(
sometimes!) For food, I typically cook my own meals, but if I'm going out to eat, I try to find a place that has a good selection of craft beer, and good food, and that's harder to find together as one than it sounds. I'm picky with my beer, and that's probably my inner hipster showing, but hey, that's me
My group of friends have a hard time deciding on one thing together, even down to the beer we drink. That's only a group of at least, 5 people
Though, I do agree that there is some truth to what you say. I think I'm part of the exception to that rule.
The Outback Steak House in Worcester, Mass is identical to the one in Phoenix, Arizona. Go to a country like Italy & there are extremely varied regional dialects & completely distinct local cuisines, architecture/building materials, music traditions etc. ... although the influence of homogenized American corporate culture is gradually spreading across the globe.
Most major chain restaurants are like that, but I feel that doesn't accurately represent the smaller, local chains at all. Not only that, but the existence of Major Chains in my area have done absolutely little to change the diversity and culture at least in the towns local to me. The cities outside of the immediate Downtown Los Angeles tend to have some deep roots as most of them are almost segregated to a certain race, with the borders of the towns mixing in a bit.
If I travel to area's like Pasadena, it's a mix of what you say but also what I'm saying. I don't know the correct word for it, but that area is a bit... "gentrified"(?) compared to what I was talking about in the previous quote.
I think all this boils down to the Southern California culture though, it's just a smorgasbord of different cultures. Like I said before, I feel that's probably just the exception to the rule.