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.
Gaming isn't fundamentally about overcoming challenges. It used to be, but it changed long ago. Now, gaming is about generating pleasing brain chemicals. When gamers "win", they feel good. When they meet a challenge that stops them, they feel bad. It's just that simple. People don't shell out $60 so that they can feel frustrated and angry. You paid for the whole game, you get to play the whole game. With lighted signs pointing the entire way and a companion to overcome the challenges if you can't solve them in the first ten seconds.