As an eBay seller, I get questions that are covered in the descriptions all the time. I try to be polite in my responses, though it can get frustrating if I've had a rash of irritations (either on- or off-site), and days like that I try to wait a bit before responding since I know I'm not at my most professional. As a buyer, I've asked questions that were covered in the listing but missed because I was tired, not paying attention, etc. If the seller responds as this guy did, I go back and double-check to see if I did in fact miss something. Either way, I try to cut the other guy some slack since I've been there.