What is the reason for wanting to leave a negative?
If it's a valid reason, leave the negative and file a complaint with eBay. eBay most certainly will act against a seller who they get constant complaint about. If it's a single complaint by one person, they won't. Also, before I buy anything from anyone on eBay I look over their feedback. I constantly steer clear of sellers with a -pattern- of certain negative feedback. It's easy to tell. Retalitory negative feedback is also easy to see on both sellers and buyers.
Go for it. If he retailates, report it. you may end up with a negative strike against you, but it's the right thing to do.
