I guess what I was really getting at is the folks who know Rails, but not Ruby. If you don't know the language underlying your own framework, it seems unlikely that you'll know much else, language-wise (like C, for instance). I'd be loathe to call someone who doesn't really know any programming language a programmer at all.
It almost seems like the arrogance alluded to by many posters in this thread comes from using a framework that is itself perhaps a work of genius, as if that somehow implies that merely using it is genius, too.
The other thing that surprised me in that post was "the barrier to entry with learning rails is a little tricky". In the context of all the flak that the "Java schools" (which seems to be all of them, now) get for not weeding out weak programmers, I would have guessed that learning Rails would be even easier. Comparison to PHP doesn't seem like a very good yardstick for aptitude.