It's true for a lot of these minor complaints about America. Of course there are valid complaints about the US, but some of them are very petty and not a real representation.

"American food quality is bad" because you go to fancy restaurants on vacation, and/or when visiting the US don't know where to find quality food because it's in different places.

"but quality food is cheap" yeah when you have to pay half as much or less for labor it can be

"people are less fat because the food is healthier" no, people are less fat because they are addicted to cigarettes instead of soda. also walk more.

"america has no culture" ... this should be obvious

"Americans are so loud" this very much depends on the country you're comparing too, but at least where I've lived Germans, Dutch, and locals(Czechs) are the loudest