A respected professional can still explain an ordinary decision without acting insulted.

Expertise and explanation are not in competition, though some people treat a question as a challenge to their standing. Asking a doctor, mechanic or builder why they chose one approach is a normal request from someone who has to live with the result and pay for it. A confident professional answers plainly; discomfort with being asked usually signals something other than competence. Being trusted is easier when your reasoning is available.

Ask your next question calmly and without apology, and see how it is received. If you are the one being asked, treat the question as a chance rather than a doubt.