Earlier quoted context omitted.
If you told me I had low tire pressure I wouldn't ask if you're a mechanic. I would look at the tire myself. If I was unable to use a pressure gauge due to a lack of my own expertise, I still wouldn't be in a position to question your observation about the tire based upon your credentials alone. The best counter argument I could mount would be, "It looks full to me" or "I checked the pressure this morning". Dismissin…
He’s either correct about your tire pressure or he’s not. You’re right about that part. That’s as far as the purely logical bit can go—then you get to economics: Should you spend the time and energy to give his claim credence? Your example is poor because tire pressure is an expertise the average person you’re likely to come into contact with likely possesses. This is not so of, say, the epidemiological issue in ques…
Here's what I wouldn't do: prejudicially dismiss the tribesman's opinion, citing his lack of authority on the topic.
Even if we accept the premises of an appeal to authority, it would follow that one would have to also be an authority on the topic before he could determine the authoritativeness of another speaker. How can you evaluate the authority of a speaker, if you yourself are not an 'authority' on the topic?
Even if you are an authority, does this status render you infallible?
No, I'm afraid the entire premise is ridiculous.