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How to be a sweetheart
Consider the other point of view.
No matter how strange or frustrating someone's actions may seem, everyone has his or her own set of circumstances. Take these circumstances into consideration and think about how things must seem from that person's perspective as a result.
For instance, if you're playing a game with someone who has never played it before, don't make fun of that person for having a hard time understanding the rules. The experience might be frustrating or embarrassing for that person, so it would be much kinder to help than to tease.