I receive gift cards on special occasions from my family and enjoy them very much as I can make purchases that I could not ordinarily afford. More than once employees of businesses have been rude when gift cards are presented.
On one occasion recently at an antique mall the owner got angry when I asked that he use my gift card before my credit card was charged. He accused me of having an attitude and I was ordered to leave the store and if I returned I would be removed.
If businesses don't like dealing with gift cards, they should not offer them as alternatives for gifts.
I have not heard of problems at the time they are purchased and money accepted.
My new rule is no more gift cards.