I had an issue a little ways back where the buyer made a purchase and then made a pile of demands(sturdy box, extra bubble wrap, ship ASAP, send tracking, item cleaned, triple tested .. etc). All this I do anyway. I looked at feedback he left for others and he was leaving neg feedback for one day late .. etc. I feared any little imperfection and I would be his next neg. I canceled his order, gave refund and promptly blocked him .. potential problem solved.
So your neg that you got my comeback to bite him in more ways than one.
Mike V