No technology stack is perfect, but I've yet to meet a stack that was pure evil. There may be some cargo-cult personalities in the Ruby community, but, if there is, it's only because there is value in it.
An infinitesimal number of sites have to deal with Twitter's scale problems. The rest can work on getting crap done instead of worrying about Maseratti problems.
Cargo-culting is what you accuse others of when they are learning and you do not like them.
The appropriate way to deal with newbies who do not fully understand the consequences of the decisions they have made (perhaps even while they are advocating others join them), is to explain their rhetorical and technological shortcomings in a way that others can learn from. Accusing someone of "cargo-culting" is just unhelpful character assassination.
Also, weak-sauce.
As someone who has seen Ruby cause major problems I'd have to say it's not too far off "pure evil"