Exchanging a gift is okay.
Fred receives a birthday gift from his grandmother that he doesn't really like or need.
Fred wants to decide what to do with the unwanted gift.
Fred takes the gift back to the store and exchanges it for store credit.
Fred decides to keep the gift even though he doesn't really want it.
Fred is able to get something he really likes and is happy with his decision.
Fred never uses the gift and it just sits in his closet cluttering up his house.