If your packaging sucks, pad more. If your buyers suck, sell more. Sell more, have more / better transactions and you'll feel better. One bad egg can ruin our days/weeks/months. Then you do X more sales and deal with X more buyers and you realize its that bad egg, not you.
Recently sold a coin set where i double-bubble wrapped the set (usually only single wrap it, but just felt like it this time) amd put it in a flat rate padded envelope that was doubled over itself since so much extra space.
The back side of the outer packaging/box had a small dent. Most people would not go as far as to call it a defect let alone a "minor defect". Probably half my current stock of these has small dents like that. It's just something you should expect, a pristine box is not common and literally its the outer box, it has minimal value to begin with, and its a dent not a tear or stain ... its like a tear in an old proof set envelope, they're a dime a dozen, it's what you get when they are 40-50 years old.
Buyer assumed the dent happened in shipping (HAHA yeah right, that dent was there...nothing was going to happen to a triple padded rigid item.). Felt the need to tell me & leave in my feedback that I need to take more care and use a box. .... also told me he would be ditching the box anyways to get the coins graded. So he never cared about the box anyway but was upset that it was "damaged in shipping". Didn't occur in shipping, and it isn't a considerable defect, literally doesn't rise to the level of noting especially in stock listings.
Also, ask anyone in my family, they think I'm nuts for the lengths I go in packaging my stuff. I think this was the only buyer to complain about packaging... except the guy who thought a small paper envelope would scratch a $20 coin.........cuz paper scratches metal...yea....right....
You just have thick skin and move on. Can't please everyone.
