Store manager rude and arrogant

I bought some steel and aluminium from the Blackheath Build, Plumb and Tile and was treated with such a bad attitude by the store manager, Gordon Phillips. Not only did he insist on charging the full price for off-cuts (which I accepted due to the convenient location of the store), he then proceeded to argue with me and insisted I was incorrect in my assumptions of their high prices (which I have compared to other suppliers). What ever happened to treating your customers with respect? Even though the store helper who assisted me was helpful, I will not be supporting such a rude manager anymore, and will follow the advice of his to take my business elsewhere.