I do not have "On Bullshit" yet, but Amazon said it should be arriving soon. Meanwhile, I have had the essays, "Mother Tongue" by Amy Tan and "From Outside, In" by Barbara Mellix, to occupy my time. Both were an interesting read and both followed the same premise: language at home for them was embarrassing so they tried hard to overcome that language, and only through that process did they come to respect the language that they were formerly embarrassed of. I liked Mellix's essay more because she conveyed the nervousness of what it was like to speak "formally" so well. I felt her unease in those situations.
While reading these essays I came up with an analogy that I liked: language is just like the clothes we wear. At home you can wear sweatpants and slippers, and you can speak more comfortably. But elsewhere, in more formal settings, language becomes more polished and proper, as do the clothes we wear. Mellix was often the most uncomfortable with her speech when she was in her "Sunday's best"- the desire to sound her best while she was dressed in her best. So I can imagine that her feelings of discomfort were figurative, as well as literal. I can also imagine that when the ability to speak as well as you are dressed becomes habit, you may look back fondly at those comfy sweatpants.