Really put off selling on eBay after dealing with one extremely rude person whining on for little reason other than to cheek his way for a refund. Never again.
Don't know context but i would not give up - sometimes buyers have unrealistic expectations - as long as you are happy that you have have honestly described the item then the fact that a customer is a bit picky may say more about them than you.
I rarely sell on ebay for the same sort of reason. The level of rudeness was so great that we called the Police. Ebay were an absolute complete and utter waste of time. Great for buying what I specialize in but in all other respects they're rubbish a complete disgrace