While American's may not say "it's just burgers and hot dogs that represent us" many not from the US think that and have a poor view of how we eat and our diets. I could take it a bit further in terms of the obesity rate compared to other countries, but we're getting off topic.
Our (The US) diet and food options are mainly a carryover from England/Europe/Italy, with slight variations and iterations made over 300 years. That said, I've been around the world and eaten foods in over 13 countries, and i can't say that the rest of the world's food choices are any better than ours. Not gonna lie and say that the pizza I've had in Naples doesn't taste better than here, because it does (but there's restaurants here that serve stuff that's 99%authentic). Hate to admit it, but the food in China tastes like poo, and I'll gladly take the US version what the Chinese have given us since they started immigrating here. Don't get me started on the bland crap that Britain churns out, or the street food in the middle East. And oh, btw, all the places I went fried their food, have nearly ZERO health code regulations (who knows what the hell you're eating sometimes), and could care less of how it's cooked. I got a meal in Hong Kong that was supposed to be chicken and it turned out to be pigeon and when I cut it open it started bleeding all over my plate. And that was at a very busy street corner diner.
They fact is, foo foo Americans that watch too much of the travel channel and flaunt the fact that they give their kids kale smoothies and make sure they don't eat that murderous gluten are quick on the "condemn America bandwagon, every country in the world is better than our redneck slob culture" because it's the cool and hip thing to do. In reality, most have never been out of their state, let alone visited the counties that they taut as healthy and generally just a better place to live...
As someone that has been fortunate enough to travel all over the world, I for one, appreciate the good ol US of A more and more every time I come home.
Sure, there are GREAT countries to visit, but none compare to what we have here. And if I want food that hails from the most southern northeast region of the West side of Timbuktu, guess what, I could probably find it here in the States, or at least a very good facsimile of it...