well, you can't deny that most women have no interest in it. All women i know including the gf just doesn't want to think about global economics, real reasons why countries are at war, bitcoin etc. Some literally say it like that, "I just don't want to think about that stuff". A bit like 'ignorance is bliss'. Majority of women is like that, so when she says they were surprised she actually had interest and knowledge about it, that's completely logical, I'd be surprised too.