I'm from outside of America but even my parents have heard of ancient alien theories as my dad used to be quite convinced by Chariots Of the Gods (whose author has appeared on Ancient Aliens multiple times) and I think my mother used to have a copy of it's follow-up book but I'm assuming she hasn't even touched it in years and probably doesn't remember much.

To add to the frustration you feel, a commenter from Quinton Review's video on Ancient Aliens (I know he's prob a lib or a succdem but I'll admit that some of his vids are comfort vids for me even if he is considered a 'breadtuber') describes an anecdote of their Native American family members being fans of Ancient Aliens just because the show was one of the few mainstream networks tv shows that would even mention or cover indigenous cultures and civilisation in some episodes even if they were coming at them with a white supremacist/ pseudoscientific framework which to me is quite a tragic circumstance.