Border guard snarkiness

I was just in the US.
I was driving back into Canada and just before the border I was to turn off into the duty-free shop for some really cheap alcohol. I somehow missed the only sign to it and overshot the place. I couldn’t turn around because it was a one way road and there were no more exits to escape. We were forced to exit the US which I think is retarded, what if I made a mistake and didn’t want to go to Canada?
We rolled through and the officer started asking questions. I said we needed to go back and he just laughed and said “Nope”. Man was he ever being an ass about it. I was really angry.
The sole purpose of spending over 48 hours in the US was to go to the duty free shop and get cheap booze and I was denied.