This is such a popular coping tactic from Americans when it comes to facing actual competition, especially from China. Everything they do must either be a lie or just stolen American technology, as if there's something inherently special about Americans that no one else has.
It comes from what people are taught in schools and from their own self perception. When those beliefs about American exceptionalism are challenged, cognitive dissonance kicks in.
https://en.wikipedia.org/wiki/American_exceptionalism