I am a veteran of a tire shop, one that prides itself on the knowledgeable staff and the quality of both their work and product. And let me tell you, it was no picnic working there. For every savvy customer out there, there are about twenty knuckleheads who don't know anything about cars period, let alone tires which in and of themselves are a kind of specialized topic.
But, in a perfect demonstration of the Dunning-Kreuger effect, EVERYBODY is a tire expert and/or knows more than the tire guy. After all, I only made $11/hr, so I must have been pretty stupid, right?
The Mechanical Engineer who buys knobbly tires for his Explorer, then brings it back half a dozen times because the tires are out of balance -- despite us balancing them every time to the 1/10 oz (the tires were balanced fine the first time).
The riceboy racer who complains that his tires are wearing out too fast, when his Civic has 5° of negative camber all around, and shows obvious signs of repeated burnouts.
The country bumpkin who threatens physical violence when we won't mount bald, corded tires on his 1980s Caprice, tires that he brought in and obviously got from a scrapyard.
The soccer mom who is mad that her tire got a nail the sidewall, and that we can't fix sidewall punctures.
The lawyer who threatens to sue if we so much as get a smudge of tire lube on his MB's chrome rims.
The doctor who accuses us of stealing his new BMW's spare tire, when it has run-flats and doesn't come with a spare in the first place.
The contractor who is angry that we couldn't finish the job, since he lost the lock for his F-350's McGard lug nuts, but that's "not his problem, we're the tire guys".
I could go on forever. Point is, not all shops are crooks. not all tire jockeys are mouth-breathers, and, and this is the most important thing: the customer is not always right. Give a chance to the guy who does it for a living.