Add to Blocklist? It's at your discretion

I could be wrong but Im fairly confident this behavior isn’t enough to warrant adding to the blocklist. While you may have had a unpleasant experience, by no means is he scamming or doing anything shady. In fact, you said yourself its just because you, “didnt like his attitude”. Definitely nice to know what sellers to avoid, but I dont think its enough for a block. The ‘eBay Grabage’ thread would be a more suitable place to post this I think. Mods, correct me if Im wrong.