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I don't remember having to return very many presents that I've been given over the years, either for Christmas or for birthdays. Perhaps once or twice. On the whole, though, I've always felt bad about doing it because it seems ungrateful to the person giving the gift. If someone has gone out of their way to give me something that they thought I would like, the least I can do is at least use it or try to enjoy it.
I can understand it when it comes to clothing, however, which seems to be what today's strip is referring to. Giving someone clothing is always difficult, especially children who are growing and who it may be hard to keep track of what size they are at any given moment. Using the returns as an opportunity to get entirely different clothing seems a bit ungrateful, though. I would have to return it and get something either exactly the same or as similar as possible in order for me to not feel bad about it.