Hardcore gamer = someone who plays only cinematic grizzed white dude games and/or military fetishizing FPS
Casual gamer = anyone that is not a 15-25 yo male, and/or plays anything outside of the previously mentioned games, especially if those games are colorful.
So basically the gaming community is full of gatekeeping, misogyny, toxic masculinity and general chuddery. They make sure they're the loudest voice heard when anything about games is talked about, and won't be happy until all games a homogenous stream of bland, hyper-realistic but with a grey filter slog of mindless action with no heart or soul. And don't you dare force them to read any dialogue or story.
So there's a bit more to this, if I remember all this correctly, Nintendo couldn't exactly call the NES a 'video game console' when they started selling it in the US because the crash had pretty much made that a really bad financial move to call it as such. And also they had to sell it in the toys section to start with, which has had and still has a lot of segregation between boys and girls toys. And also considering how brick and mortar stores have acted for a long time, they likely had a bit of a hand in this in the way of demanding nintendo to pick if it was a boys toy or a girls toy or else they won't stock it.