I hear you.
As an ebay seller, all glass, mostly paperweights, I do my best to properly identify items.
Once in a while, I'll post here asking if anyone knows, and when I do, I always give credit on my listing.
When I get it wrong, and you bet, I do get things wrong, I love it when someone tells me. I always reply with a thank you, and then edit or cancel/relist the item with the correct information.
I just bought a "lot" of three pieces, seller claimed 2 were signed Rollin Karg, and that all three were dichroic paperweights. When I got them the two signed Rollin Karg, were actually signed Karg, which is the signature of Rollin's nephew Jim Karg. The Rolling Kargs should sell around $40 for that size weight, whereas the Jim Karg of that size sells for $15-$20. And none of the three had an iota of dichroic glass.
I notified the seller, explain the differences, and giving her some links to dichroic pieces, so she would understand the difference. I told her I would be a nice guy, and keep them, figuring I would sell them at what I paid, and it would be easier than demanding she take them back. She never responded, and of course now, I keep debating making her take them back, because she's too freaking rude to even say, oops, sorry.