I live in Canada. Lived my whole life here, but I went to the US twice (few days).
One thing that I have deeply noticed there was how much more sugar and/or fat was in pretty much everything. I can't really eat in restaurants with my allergies (so I ended up buying groceries instead), but even when I could, the McDonald's chicken nuggets there tastes... sugary. A lot more sweet than those in Canada.
It's a stark contrast with Canada, where everything tastes salty instead. Take the bread, for instance. For some reason, in the US it's almost kind of a cake, whereas here it's too salty to be like an American bread. Even your chips taste different. And don't get me started on the fries.
Also, something else that is deeply disturbing me is how most of your flavors are artificial. When I buy jelly here, it's mostly natural stuff. In the US, it's flavored corn syrup. In fact, I'm usually more surprised not to see corn sugar than the other way around when I buy food in the US.
Am I the only one who feels this way? People who travels a lot (from or to the US), did you notice that too?
Anyway, it's mostly curiosity at that point, not shaming or anything.
PS: For those reading-challenged, I have to eat to McDonalds when I'm moving from Canada to US. Why? Because I can't cook during travels. I can cook when I'm at an hotel, but not in a car. You cannot bring food between US and Canada because that's the law. So I cannot cook before the trip. I have to literally eat at a restaurant and so McDonald was the safest for my allergies.