I think in some cases it is relative. But in other cases it is not. For example you complain to waste gas to drive to work on one day when you shouldn't have. That's a valid complaint to me because gas = money and money = food / shelter / water to drink in our society. So using that gas money could potentially mean you are hungry instead.

But, for example, people who complain because their iPhone 5 is delayed because of a hurricane, then yes that is selfish. Or another thing I thought was selfish was the marathon runners who were calling up their hotels to make sure their rooms were still available, and then angry to discover they would not be because the hotel was housing people who lost their home. That is selfish.