This is not the right attitude to bring in to the workplace. You'll have a range of people from executives, to clients to co-workers in other departments who don't know what UNIX, APIs and POSIX are. If you can't communicate technical matters nicely then you have not yet developed the right attitude for a professional working environment. It's the same thing with doctors when they create metaphors to explain complica…
As a tutorial for those of us like me who sometimes stumble in situations like this, could someone who found the OP's responses to the recruiter unprofessional please post example phrasing of what the OP should have said? Let's assume the constraint that the OP will refuse to lie (so they won't just change their resume to 'Unix' instead of 'Unix-like').
This is a genuine question; I often can't think of how to phrase things and I think an example would be educational.