Sounds like you didn't get out much. Sometimes I wonder if it's a joke that I haven't been let in on, or just willful ignorance. I hear it not just with cheese, but also bread, beer, chocolate, etc. High quality versions of every single one of those can be found with _minimal_ effort. You have to deliberately choose not to notice all the breweries, bakeries, dairies, and chocolatiers.

"You can't get good ____ in the US!"

Which might be true if you only ever shop at a supermarket or your only exposure to food in the US is a meme, Hollywood production, or the crappy nonsensical 'American' aisles you have in your respective countries.