At least they left positive. But some people will never be pleased no matter what you do.
I've had a horrible seller leave "positive" before because it was the only option but she absolutely cursed me out and called me all sorts of horrible names because she wouldn't honor her claim to combine shipping. It was absolutely awful. She even posted my personal information such as email and first/last name on the comment. Ugh - NIGHT MARE. She even created a second profile to harass me because I had her first one blocked. Terrible terrible seller. [non-pony items]
Anyway, ebay was super helpful and promptly deleted my comments and froze her account. Never ever again! Oh she was terrible. ><