Ironically, I'd disagree and say that your CEO was being intellectually lazy by explaining your preference for proportional font by the absurd declaration that

Ironically, I'd disagree and say that your CEO was being intellectually lazy by explaining your preference for proportional font by the absurd declaration that anyone who does it is simply sophomoric or inexplicable. However, I would not take this kind of instance of intellectual laziness to be indicative of a more general complacency when it comes to ideas, tools, or self-development more generally. By contrast I think intellectual curiosity is a great thing when present and lamentable when not, but I don't think it's a prerequisite to be a good professional in almost any field, including programming related ones.