A brain-hurty moment that happened about 20 years ago is one that I've never forgotten. Decorating the Xmas tree today brought it to mind.
That was when I had a hobby-business. I made ceramic Christmas ornaments and sold them at holiday craft fairs in the fall and winter. Note: I MADE them, starting with molds and slip (liquid clay.) I had a kiln, so I did my own firing. I did not buy the fired ornaments ready made.
This crazy woman came up to my table and announced "I don't like these plaster ornaments. They're too heavy."
Me: It's a good thing they aren't plaster, then. These are ceramic, so they're hollow.
CW: No, they're plaster. I've seen them at the craft store.
Me: I'm afraid you're mistaken. I poured and fired these myself, starting with the molds. Plaster ornaments are solid, and yes, they are heavy. Ceramic ornaments, like these are hollow. (I show her the bottom of one of the larger pieces.)
Plaster is a different substance altogether.(Multiple exchanges follow, wherein CW tries to convince me that I don't know anything about the handcrafted items that I'm selling.)
CW: I know I've seen these plaster ornaments at Michaels. Why are you pretending that you made them?
Me: (getting annoyed)
If you're not going to buy something, please clear away from my table, so that people who ARE willing to buy can get through. (There may or may not have been on my part at this point.)
(CW flounces away.)
After a while the craft fair manager came over and said "You know, all the crafts are supposed to be hand-made to qualify here." After I detailed my "discussion" with CW, the manager just shook her head, smiled, said "OK," rolled her eyes, and wandered off again.
It takes a pretty Special Snowflake to argue with an artisan that YOU know more about her craft than SHE does!