I think philosophy can be taught as much as anything else. As I understand it, philosophy is concerned with a methodology of thinking. Like any other methodology, you can choose to accept, reject or adapt it. I assume what La Scaramouche meant to get across, is that nobody else can make decisions for you about what to think. I don't think anyone is disputing that.
I know nothing about philosophy. If I had the time and financial resources, I would correct that!