Another reading of this paragraph is that it's essentially douchebaggery.
It's even worse in Britain. Anything remotely smart or cultured is considered "pretentious" etc.
http://www.telegraph.co.uk/news/2016/06/10/michael-goves-gui...
These days, the liberal arts generally relate to the humanities: language (e.g. English degree in the USA), fine arts, history, anthropology, sociology, philosophy, etc. It's the study of people and groups of people, instead of the physical world and the laws that operate on the physical world independently of the people that occupy it.