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If that's the only kind of people they hire, where the heck do these kind of interviewers come from?

Most likely because they didn't have that "totally positive effortlessly nice and socially easy" vibe.

You know, sometimes, I feel like that's a personality trait that's often under-rated.

Vibe or culture fit, whatever you call it, simply being extremely smart is not sufficient and far too many people think it is. :)

That's probably the right attitude to take in hiring. Bad code is difficult and expensive to discover and fix and a bad hire is difficult and expensive to let go.

With proper code review, I don't think bad code is difficult to discover. I also don't think dismissal is very expensive for large corps. For smaller companies or start-ups, the game is entirely different.