re: Would you feel like you took advantage of someone in this situation?

Leave the gift card as an extra tip next time. If the person ordering gets a cash order, they use the gift card to pay. I used to do this when I waited. Profit. And you don't feel bad.

I don't think what you meant was bad, but I think managers are so used to people being upset they'd rather give a gift card to shut you up then deal with the chance of you being a pita.