I’ve spent a fair portion of my professional career working for engineers of various types. The issue lies with the people who assume their intense knowledge of their chosen field of study means that they are experts in all fields of human existence. This pomposity leads to the stereotypical engineer who gets trapped into CAD models that don’t translate to the real world and get belligerent when that gets pointed out. Certainly I’ve met engineers who aren’t like that, but the stereotype exists for a reason. Perhaps it’s Electrical engineers that are the worst? I meet a lot of them.

Retired school teachers are another problematic customer who knows more than any seasoned journeyman.