No disrespect to people in foreign countries, but they are approximately the world's biggest suckers, when it comes to believing things about America. No, all Americans are not cowboys; we don't all own guns, and work at Disney Land; and we certainly don't make any good wine.
By 14, I had learned to make my own Mad Dog, from Ribena and a bag of sugar and powdered yeast. I remember being quite certain that it tasted better than the real thing, too.