I remember arguments like this when I was in New York on a project and the New York engineers would try to tell me (7th gen native Texan, raised in Texas) what Texas was like, when most of their knowledge came from the tv series "Dallas", "Urban Cowboy".
So I may discuss culture with a native and bring up things they may not be aware of... but there's always going to be "you're actually there and I'm not".
Views on anime are changing.. with every funeral
(old science joke... science improves with the funeral of every crusty recalcitrant scientist).
When I played D&D in the 1980s I actually had to deal with people who seriously thought I and my friends were engaging in Satanism. Of course, they were Baptists and also claimed that Methodists were Satanists so YMMV