American here, it has vastly eroded in the past two decades among the younger generations.
Plus some notable milestones:
2001 Patriot Act - very unpatriotic and anti-american
2008 mortgage crisis - huge bailouts for large corps, nothing for regular joes
2016 election of Trump - reality TV president, collapse of "norms"
2020+ covid response - unprepared and poorly handled, contradictions and backpedaling abound
Probably lots more I'm omitting but it's much harder to make the case we're #1 these days without adding caveats and qualifiers.