This guy is over-the-top, but I'd have less sympathy for him if both the effective and indirect penalties against sellers for even a tiny amount of negative/neutral reviews weren't so draconian.
No the neutrals don't have so bad a direct effect, but eBay has by this point conditioned buyers to expect 100% positive feedback that even dropping down a tenth of a percent or having a couple of neutrals over the course of a year has a measurable negative effect on sales.
I had a recent buyer leave a neutral because he didn't like the way the International Shipping Program repacked an item that was sent overseas even though it arrived undamaged, and another where a buyer left a neutral feedback after I gave him a 100% refund including original shipping when he sent back an item that he had clearly broken through misuse and returned under the regular return policy, NOT under an INAD.
This was a camera lens with a macro lockout on the zoom where he forced the focus with the zoom switch on until the zoom mechanism completely broke, which would have required a hugely unreasonable amount of force to do. The thing is, the chucklehead didn't even bother to take the switch out of the locked position before he sent it back to cover up what he did!
In both cases, neither would remove the feedback after polite requests, nor would eBay remove either feedback, because they were "the buyer's opinion." And of course, both have affected sales.
I left responses to the neutrals giving my side (in the case of the ISP sale, I unfortunately didn't know it had been repacked until after I sent it), but you can bet I sure was tempted to give both of these buyers a real piece of my mind.
