This is exactly true. There are certain things about which you absolutely need to be anal about being pure, such as scientific experiments and theoretical deduc

This is exactly true. There are certain things about which you absolutely need to be anal about being pure, such as scientific experiments and theoretical deductions/proofs. And there are others where you need to be more practical. This one person seems to have been applying the same mentality to both, which is a personal flaw, not solely a result of having more academic credentials/experience.