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From your name I’m guessing your around San Jose area. If you really want to see American culture travel to the Northeast, travel to the South, and if you bored enough to the Midwest. You’ll be punched in the face with just how different these places are culturally, and when you return home you’ll realize San Francisco/ San Jose had a strong culture all along, you were just so used to it you called it normal.
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Two points
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1) You're distinguishing culture from economics in a way I don't think is entirely accurate.
Consider the examples you thought of when you discussed South Asian and French culture - mostly culinary, right? But you can't extract the unique cuisine of those cultures from the geographical conditions that made certain ingredients more abundant, the trade networks that allowed many of those non-native spices to flourish in places like India or Sri Lanka, or the unique family/community compositions that made certain dishes more popular. 
As dated a stereotype as it is, the modern hamburger is American culture. It's a by-product of their tastes, their values, and the way they construct their daily lives. It's also a product of their pluralist cultural values, first brought over by German immigrants but quickly adapted to something uniquely American. There's also soul food, the unique foods that are associated with "fairs" in the US, or even the unique midwestern culture surrounding casseroles (which is deeply family-based). That is a reflection of deeper values than just consumerism. It's their culture. 
2) It's easier to overlook US culture because it's so globally ubiquitous
Because American culture is both a) pluralist, and b) hegemonic, it can be tough to see American culture as its own distinct thing. Because when you talk about those unique cultures, you're often comparing them to the global culture. Well, that global culture is probably America's most significant export.
The very concept of the "teenager" is a by-product of modern US culture, and it's derived from their education system, their purchasing decisions, and their family values. People didn't think of "teenagers" as this distinct group of people until the mid-20th century, when the idea of a "youth culture" emerged for the first time in the United States. Before that, there were children and there were young adults. This idea of a unique adolescent stage is largely an American phenomenon, that we've all come to accept because America has exported so much of their culture. 
3) There are massive American cultural achievements by any metric
You said it yourself, modern music and film are basically American culture. Rock-and-roll, hip-hop, R&B, EDM (yes, that's from Chicago and Detroit), are all US exports. Everything about the way we do cinema has been informed mostly by Hollywood. New artistic mediums in the form of video games emerged largely from the US. Most of the greatest theatrical performances of the day are in the US on Broadway. Any list of the greatest literary figures of the 20th century is bound to include Americans like F. Scott Fitzgerald, Ernest Hemingway, or Maya Angelou. 
You mentioned the Superbowl - what about other cultural traditions surrounding sport in the US? Everything that goes into a baseball game, or a basketball game, or the way communities rally around their local high school football team. That's all unique culture that has emerged in the US. 
This is to say nothing of their very unique religious customs in many parts of the US, much as I might find many of them problematic. 
In general, I think the main problem here is that you're conflating US culture with the global culture, because the US is the preeminent cultural exporter. But that doesn't mean it isn't uniquely American culture, with deep ties to American values. >


the modern hamburger is American culture.

Kinda, but in Sri Lanka you can find a lot of ingredients that are specific to that part of the world and are usually healthy.
The American hamburger makes you fat, creates health problems and it name comes from a city in Germany. If their values are to be bush pigs then fine, and im not trying to bash anybody, everything is fine if not used frequently. But that is what consumerism is, using more then you need.
As you say there are a lot of specific subcultures but the big one that connects the US isn't somerthing OP wants to indulge in >

So your metric for whether a culture is “consumerist” is whether their food is fattening? 
If “using more than what you need” is consumerist than pretty much every European culture is just as guilty as the US, alongside much of Asia, most of Latin America, and chunks of Africa and the Middle East. We all use far more than we could every possibly need. That’s the beauty of agricultural surpluses and modern, specialized economies. 
Consumerism is a specific preoccupation with vapid material goods. Are you going to suggest that European football is not highly commercialized? That people in India aren’t motivated by the desire for nice cars or expensive clothes? 
I’m not American, but I have lived there and I don’t see it as being any more fixated on consumption than any other country I’ve visited. They have a unique cultural identity beyond the desire to purchase things, but they -like the rest of us- live in an economy that also encourages the production and consumption of material goods. That’s no different from pretty much every other modern culture. The only real discernible difference is that the US is still by far the richest country in the world, so they happen to be able to buy more of those things.
Suggesting that means there is no unique American culture beyond the desire to purchase material goods just betrays a shallow, one-dimensional idea of the US. >


When you picture the culture of France for example, the images that come to mind are a culture of artists, authors, chefs, and local artisans, bakers, cheesemongers, etc

Are you arguing that the dominant American culture is consumerism? Because every moderately sized American city also has all those things…
To me it sounds like the lack of homogeneity is part of the problem. Is Texas bbq included in the “food that America is known for”? Or New York Style pizza? Or New England lobster *rolls? Or does America only get to claim the foods you can find across the entire country?
Edit: forgot a word and now I’m hungry and thinking of more foods. Like poboys in New Orleans, Nashville hot chicken, Buffalo wings, Maryland crab cakes, soul food… (Also anyone in the midwest or west coast, feel free to chime in) >

TexMex, California Pizza Kitchen, Low Country Boil, Chicago Pizza, Detroit Pizza, Georgia Pecan Pie, Alabama White BBQ, Memphis BBQ, Cincinnati Chili ...
Great, now I'm hungry, too! >

I’m about to doordash all of the above, wish me luck in my bankruptcy hearings