Been to the US a few times. Your food tastes extremely average and the only difference to anywhere else is that it has about 3 times the kcals and half the nutrition. I’ve had heartburn and constipation virtually every time I’ve visited.
And your beer is possibly the worst in the world. It’s pisswater.
With opinions like that I’d be surprised if you’ve even left your own state, let alone the country.
The reputation comes from the US military being stationed in the UK during the height of WW2 rationing when there was an extremely limited list of ingredients to cook with. They were unable to associate a country under an attempted siege from U-boats with a reduced supply of food.
We do have a love of beige food at times, but it’s essentially our version of chicken tendies.