Dairy Queen - Harvester

Well I saw a coupon in the coupon book and clipped it for a free combo if you buy one and a separate order for a mini blast and get one free. When I got to the window a black gentlemen asked me rudely if I have ever used the coupon at their store? I said not these exact ones but yes. He went on to say they were for a different DQ. I was thinking at that point to just go to the other one as my money is green every where. I found this manager to be a bit full of himself and I am not sure if I will return as he was loud enough to embarrass me. I did tell him I know the owner and the man is good people. Hopefully this will be addressed.