alt Hacker NewsGood code is subjective, especially once you start wandering into the territory of more esoteric approaches such as functional programming, domain-specific languages, code-generation, etc.
Bad code is one of those things that we can almost all agree on, often even the person writing it.
Alternatively: I don't know how to make a good movie, but I can recognise a really bad one, and you'll almost certainly agree with that opinion. You and I however will almost certainly not agree on what our favourite movie of all time is. The nuances and personal tastes become more important at the last few percentage points approaching 100% "like".
I think we can agree on a version of bad code, specifically extremely bad code.
Just as we might agree on universally panned bad movies, but disagree on cult followings or one of us for a particular reason can't stand a popular movie.
That is to say we can all agree on extremes, but just because something isn't extremely bad doesn't make it good in everyone's eyes and that's where the contention is.