It is rude to insult a gift.
Jack got an ugly sweater as a Secret Santa gift, and he does not like it.
Jack wants to accept the gift.
Jack accepts the gift and pretends to be gracious about it.
Jack displays his disgust over the sweater and says something about it.
The giver's feelings are spared and Jack does not look like a jerk.
The gift giver has their feelings hurt and is upset.