I think some guys are just spring loaded to instruct for some reason. Not defending them or anything, I just don't even think they realize how demeaning it is. Actually had a sim instructor try to start instructing me on how to plug in my headset, so I obviously asked him to expand on his explanation. If I can't plug in a headset, then I obviously have slipped through one to many cracks.

On that note, not sure if it qualifies as toolish, but when one pilot asks to verify a radio call from ATC the other pilot will start talking over the ATC when they read back the clearance. Personally never understood that, I mean I already asked ATC to repeat themselves, so what is the use in repeating what you heard the first time.