most people who didn’t grow up on the internet tend to use swedish tone in english writing and it comes off as very blunt.

That also makes a lot of sense. While I remember dialup, I also was very social on the early web, BBSs, and MUDs, which definitely led to adopting more personable means of communicating via text. I’d say that it’s not just a Swedish phenomenon but also occurs a lot with native English speakers who never adapted (ex. typing in all-caps).