I found the ad online. I didn't find it offensive, but I generally like Neil McDonough, the actor in the commercial - I remember him as Lt. Buck Compton from "Band of Brothers". Didn't like him as much as the bad guy in the remake of "Walking Tall".
It's the typical "Americans are better than everyone else at everything" commercial. Chevrolet did something similar in the 90s with the Camaro "What else would you expect from the country that invented rock and roll". Or, is it any different than the Bob Dylan Chrysler Ad "Let the Swiss make your watches, let the Chinese make your phone...We will build your car".
It's a bit of a narrow-minded ad campaign. Let's face it, most of us here appreciate cars, period, regardless of their country of origin. While LBCs may be our passion, we can appreciate cars that are made in places like Japan, Italy, Germany, England, and yes, the United States. When Mazda first introduced the Miata, they didn't say "Hey, we took the British Roadster and made it better because we're Japanese and everything we make is more reliable than what you're driving"...although the Miata was good enough that they could certainly make that boast. Mazda took the other route and in their advertising paid homage to the great British roadster and claimed the Miata was the recipient of that heritage. The result was a car that now stands on its own merits as a car, not because of the country it was built.
BTW - does anyone realize that the Miata is celebrating its 25th Anniversary? If that doesn't make you feel old, nothing will.