It takes a lot of effort and you don't see immediate results. I'm sure most people have encountered book-smart individuals with neither common sense nor social skills. Or pretentious types who read a few chapters of Kant and feel the urge to let everyone know how philosophical they are. There are loads of people who learn a little rationality and act as though they are perfectly logical beings. Pedantry, arrogance, and pretentiousness trap many a beginner; such types make poor ambassadors. This essay, for example, got me to really reflect on my writing style and how I was presenting myself.

In short, people are liable to generalize from bad examples and associate rationality with quarrelsome pedants spewing forth incomprehensible jargon.