That's a good story! Chances are he's got more problems to worry about than his eBay feedback or tarnishing your eBay image. Go for it, you can always rebutt his negative feedback and even set up a webpage with the emails of the transaction if you're concerned about what others may think of a negative feedback on you. Honest and legittimate eBayers are understanding of these situations most of the time.
I guess profanity does help out sometimes, Well shit, that's great!