I've found that pretending to know someone's profession, or one related to it, is generally a very bad approach. It's easily seen through, at which point you're worse off than before. Instead, what I do with members of other professions is try to impress on them that I do not know their business but respect its complexity and our roles within the scenario. Whether it's a doctor or a plumber or even a computer technic…
Speaking as an automotive mechanic and a tradesman, nothing sounds more despicable than this half-ass attempt to "game" human interaction to save a few precious seconds in your day. You wouldn't do this with a doctor. You wouldn't do it with a police officer. So why do it with me? Or tech people? Are they somehow less impressive? I mean you are seeking their help. Maybe show some respect. if you're ever at the garage…
Doctors enjoy a higher reputation for "honesty and ethical standards" [1] and have the specter of medical malpractice if they yield a misdiagnosis, particularly if it's one that harms the patient. There is no equivalent for mechanics and frankly the public on average trusts mechanics far less than doctors. Auto mechanics got 32% in the high/very high trust category vs 67% for doctors in the latest Gallup poll. [1]
Anecdotally distrust of mechanics is such an issue I distinctly remember my youngest sister getting approached by car dealers from all over the city after she took auto shop in high school. She was told dealership repair shops needed women because some female customers simply didn't trust what they were being told by male repair shop representatives. Despite this apparent need the pay offered wasn't enough to entice her from just working at the O'Reilly Auto Parts down the street.
[1]
https://news.gallup.com/poll/1654/honesty-ethics-professions...