Can you use canadian money in US?

I went to this store to buy a bag of candy and it was .25. I gave the cashier and in return for change I received .75. But, It had a one dollar bill and some coins in it. I looked into her hand and there was this unusual big brownish goldenish colored coin. She said it was a dollar. But, I said this isn’t canada. then she got irritated and gave me my dollar bill. Was she trying to rip me off? or try to take advantage of my age? I’m 15. Does she think that I don’t know anything?

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