I'm pretty sure the only thing a buyer can do wrong is threaten negative feedback. Had you left negative feedback, he may have been able to have it removed. I can see why people are jumping on the blocking bandwagon. My earlier post was just saying there isn't a need for 3 pages on this thread telling everyone you blocked both parties and comparing who is more "*******". The OP got half his goal accomplished as many buyers/sellers have blocked the seller he wanted them too. Unfortunately he's not going to find people backing him up for the way he handled it either.