I dunno if there's ever been such a thing as a unified 'nerd culture'. It's always seemed so Balkanized. The Vampire players looked down on the D&D players who in turn looked down on people who only played RPG video games, and they in turn thought the Vampire players were a bunch of pretentious Sisters of Mercy wannabes. While, of course, nobody had more contempt for Vampire players than other Vampire players with different opinions about how Vampire should be played. The anime fans (whe they weren't too busy looking down on other anime fans who watched dubs) looked down on the comics fans, while the comics fans looked down on the people who only liked superhero movies. The historical wargamers looked down on the Warhammer players, while the Warhammer players and the Warmachine players busily looked down on each other. And EVERYONE looked down on the furries.
Buffy, for instance, was a big part of mainstreaming 'nerd culture' back in the late 90s ... but even Buffy took a whole bunch of rather snide shots at the 'wrong' kind of nerd. Even now, we've got a whole lot of D&D players claiming how 'the real' D&D is a completely different and far superior thing to the product that Critical Role dishes up.