Am I suppose to rat on someone who rats on me in the work place?

She’s lazy, arrogant, selfish and rude and management is punishing both of us with our schedule because we don’t get along and it’s not my fault. I haven’t mentioned everything she’s done and said, yet I’m being punished because I’m mean and ignore her when I’m in a position to tell people what to do.

Am I suppose to rat on someone who rats on me in the work place?
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