Agreed. If I wanted to buy from shopping telly and presenter was arrogant, or had a pushy sales assistant in store then I wouldn't buy it if my life depended on it.
My friend and her husband went to Curry's years ago to buy a computer. They researched thoroughly and chose the one that suited their needs at the best price. In Curry's the assistant practically refused to sell it to them, trying desperately to steer them to other models, and was really pushy. I can't remember if they managed to buy it or went elsewhere. I would have told him to Foxtrot Oscar before suggesting where he could shove his computers...