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You were not condescending, what you wrote about POSIX are facts (with a slight addendum that if you grew up on Solaris, HP-UX and IRIX like some of us, those are true UNIXes). You simply had the misfortune to run into an inexperienced recruiter. It happens often whereas it shouldn't happen at all: I've been preaching for years that IT professionals should be recruiting other professionals, instead of companies putting up someone who isn't formally trained in computer science to do something they don't really understand. After my own experience, I'm of deep and firm belief that recruiting good people is part of a social contract of every good IT professional. It is too critical to be left in the hands of the non-practitioners.