National Automotive Parts Association / NAPA Auto Parts review: Rude customer service

Today I was treated like a 3rd class citizen from the NAPA counter sales agent.
I went in to NAPA to return and repurchase an item which I bought 4 days ago and which did not work. The gentleman did not greet me just took the item and "tested" it and shouts back at me saying it works thereby implying that I am lying. I explained that I ran the item for 3 days and although the lights were working the item did actually not work.
He then gets a replacement item does the required paperwork and tells me " the warranty is done you can go" with a rude and brusque attitude. He was so rude in his mannerisms I had to ask him if he was ok and if there was a problem. His reply again was "we are done here you can go".
Since I needed to know more about the warranty I did not leave, he did help me but I wish I had not dealt with Sean. He has no understanding of customer care. I have a witness to the incident who can verify this. Sorry NAPA, you are losing customers.