From the company's 'About' page: Do you seriously make your stuff in the USA? Yep. We worked long and hard to get our designs and chassis so they could be assembled by first-world labor for prices similar to the Chinese. ... But wouldn’t it be cheaper doing it in China? Maybe. But we’re not going to find out. Well, hell, all your parts are probably Chinese anyway, right? Um, no. The majority of our parts, on a total…
I'm not entirely sure that I'd consider that insulting, but, from the forward: Be memorable—this isn’t about getting everyone to like you, this is about getting some people to love you. The company isn't built around catering to a massive amount of people, but instead a niche. And there's definitely a market out there that is very much swayed by the "Made in the USA, from parts sourced in the USA" line of rhetoric
But this is still an instance of taking the low road. We all live on the same planet, and commercial jingoism isn't the way forward.
Edit: if you "aren't sure if you consider it insulting," try reversing the roles. Imagine a Chinese company that brags about how they avoid using parts and labor from the US whenever possible. How do you suppose that will play in Peoria?