This is totally unrelated to rails. This is about OOCss and what's wrong with twitter's bootstrap in this context. The overall conclusion about doing OOCss might be right but there are many other and better resources for this topic- without those bothering meme images.

Surprisingly enough, the first resource I found describes exactly the same example about sass placeholder and %separator http://ianstormtaylor.com/oocss-plus-sass-is-the-best-way-to...

https://www.hnsearch.com/search#request/all&q=OOcss

This talk is somehow a starting point to the discussion about the best way to do OOScss in Rails apps and if it is possible to introduce some convention in this subject.

You would need to know the basic context and the origin of this talk to understand it's purpouse and to have any right to judge it.

There is also a note under the very next slide with example linking it with Ian Storm's post. The link is also in the 'further reading' section at the end of the presentation.

Interesting, I think I've found some reading to start my memorial day.