I can't speak for the parent, but most programmers and CS grads that attend bootcamps aren't so much interested in learning Ruby as developing a better intuition for web application architecture.

This, I'm sure you'll agree, makes much more sense than simply learning another Algol-based language. To turn this on its head, I can write C & C++ passably but that doesn't mean I'd feel qualified applying for a job as an embedded systems or game developer.