I'd say in general, when you don't know, like in this case, just say 'don't know'.
The idea is to make an algorithm that can pick up the 'mood' on twitter. So any statement that represents happiness in some sort of way, like 'we won' or 'it's sunny today', .... = positive. Insults or negative feelings or anything bad = negative.
You can take a peek at the 'results' page to see some already labelled statements.
Perhaps being or calling someone spoiled is sort of a negative thing though,