I suspect his problem is geography. I haven't lived there, but I can imagine that in NYC when you deal with Rails shops you get to talk to sleazy "MBA types" as opposed to traditional startup hubs like SV and Boston, where you typically have no problems finding cool hackers to work with.

BTW: I don't think he is an arrogant asshole, he's just just brutally honest, NYC-style. And yes, Ruby/Rails folks often smell too much like "get-rich-quick" in their blogs/posts online, so I am not surprised if they are indeed shady in real life.