Third Generation Homes

I was trying to sell something for my 81 year old grandmother who is not as tech-savvy as myself. I began by looking up what she had paid and googling and calling some local stores to see what their prices were. Then I choose a reasonable price and listed the item. I received an email from the owner of the business. He said he was interested. However, when I told him the price he said that he could buy it else where for nearly nothing (below distributors purchase price let alone well below retail). Since I knew this was not the case I told him that I knew he was lying and was attempting to use the lie as a tool to negotiate my price below its value; and therefore I had no interest in doing business with him. He proceeded to respond, unprovoked by verbally berating and insulting me with a