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.
HotS was unironically good when it wasn't in permanent maintenance mode, as was Paragon when it was in alpha/early beta before it became a shitty league clone and subsequently got cannibalized to provide Fortnite with more servers and UE4 devs as Epic frantically retargeted everything they had to capitalize on Fortnite's (then) new Battle Royale mode.
LoL on the other hand is a fucking awful game that's aggressively janky and unfun to play, to the point that I uninstalled it without finishing the tutorial. I have no idea how anyone could even get into it, and can only assume almost all of its new users are just banned existing users making new accounts. Never played DotA so I can't comment, but I understand it does a lot of the same fiddly bullshit LoL does so it's probably dogshit too.
DotA had lots of bullshit for its main mode like no surrender at all but at least theres custom modes that is alwaya available and you dont need to grind blue points to get characters.