being called "broke" by a minimum wage employee

On new years day a friend and i went up to UDF to grab a bottle of root beer. The total was $1.39 and my companion pulled out his wallet to settle the difference. Problem was he had no cash, so he pulled out his credit card. The cashier smirked and said "wow! did you see that moth fly out of there?" It took a minute to get the joke, so she explained to us, "the wallet is completely empty, thats why i said a moth flew out of it." We kinda laughed, then she went for some more "hey there, does your wallet have green lining in it so you feel like you have money, even though you are broke?" I couldn't believe she took a second rip on my friends empty wallet, it feels weird to have a minimum wage employee bust your chops about being broke.....