Going by the Golden Rule, you would want anyone choosing you a present to choose the thing they know you will like best, and get most enjoyment out of, you wouldn't want them to be selfish and just choose something they like. So, therefore when you're choosing a present for them, you should also put aside your own wants, and choose whatever you know they will like best.
Well, yes, that is the other side of the coin.
On the first interpretation, the Golden Rule says:
Morality requires us to do unto others as we would have them do unto us if we found ourselves in their position with our own tastes and preferences (and, perhaps, ideals).
On the second interpretation, the Golden Rule says:
Morality requires us to do unto others as we would have them do unto us if we found ourselves in their position with their tastes and preferences (and ideals).
Problem with first: I would like it if everybody was to give me all their money. Therefore I should give other people all my money = counter intuitive. Or the example I gave about buying somebody a present.
Problem with second: This is basically "do what people want of you". So if somebody else would like to hear about what you did last night, you would have to tell them. If somebody else would like you to do something intimate with them, you would have to do it = counter intuitive.
So which interpretation are you going to go for?