Well, I’m not going to give you my list, but I’ll tell you how I’ve been compiling it.
I’ve started perusing the TRS and Level 2 Sellers in my sub-category looking for 1 star reviews in their ocean of 5 stars. It always seems to be 1 star, never 2, never 3, and never 4 they receive. It’s plain to see that these Sellers work hard for every review.
I consider that the Buyer may have had a legitimate complaint, but when I read the Seller’s reply, and they convince me they were treated badly, then on my spreadsheet the Buyer’s username goes.
Now, should one of those Buyers contact me, I’ll know who I’m dealing with. This may seem like a lot of work (it’s not), but so is working with nasty people.