It's not an SV thing. While in SV the exclusionary tendencies are as strong as anywhere else, they are not the leaders but the followers in this. They didn't in

It's not an SV thing. While in SV the exclusionary tendencies are as strong as anywhere else, they are not the leaders but the followers in this. They didn't invent it, just enthusiastically embraced it, because their peer bubble ensures pretty much everyone thinks the same (or is hounded out). But other places - like certain academic disciplines, or certain entertainment industry branches - has gone much further on this road. And, of course, official mainstream politicians are now openly pushing it, something I would be surprised to hear in America a decade ago.