Why is passive-aggressive behavior bad?

I don't know, I can't say I like this behavior. For instance, my sister much older then I, she is 24 and when she is upset with
me, or anyone in the family she is very silly and childish. She will change the password to our family MAC computer, she will purposely hide food in her room, she will sulk around the house, make indirect petty comments, she will stomp around the house, she will purposely make food that's meant for everyone and not share. That, this is her message "I am angry"

this is very immature behavior. How to fix this?
 
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