People in other professions have similar issues. Some 'smart' folks feel as if they should be able to understand everything. It probably often works for them, after all, how did they become 'smart'? But, it's a fine line between genuine interest and distrust per se. Try to assume good intent, consider it interest and grow your ability to explain. At some point you might have to call it as a poor use of time and move on, but if you can use the time to grow on both sides of the discussion - bonus.
This is what I suspected, with my perception being tainted by the "grass is always greener".
I also can't say we aren't collectively to blame, or at least somewhat - as a bunch we can be poor at political negotiation/skill, lack of standardization, etc. I kick myself every time I miss an estimate that I've given, because I know at some level that has to erode trust. Or when my manager does press for more details as to why something should be done and I can't come up with a really strong justification at that moment, etc.
