and a non-sensical aspect is to contemplate the doubling of zero - whereby the use of the term "doubling" anticipates some value and the actuality of zero devolves the idea into near idiot'sville.
Are you saying that zero cannot be doubled? It is a bit too late in life for me to re-learn that...

It sounds like his problem may be with 0 itself. Given that that is 50% of your job, I can see the potential for conflict.