Negative Feedback Help Please.

[dior_kookla]

Recently sold an item, assumes buyer is happy then notice today buyer has left neg feedback.  States item had fault (but lied in her info on my fb description), i did not know this and relooking over photo and couldnt see the fault myself but not to say it wasnt there... I would have been more than happy to refund (as stated in the descrition) as we know we are human and can make mistakes... Anywho this ebayer is new a member of less than two weeks (fb rating of 2). 

My question is how can new ebayer's who maynot be familiar with the solving of issues before leaving neg feedback.  Why are they not made to reach a certain amount of transactions to familiarise themselves with the "usual" before being able to "ruin" someones feedback score. This is of course assuming they are new not new names.

If anyone has had the same issue or can give me any help on this would be great.  :-)))