Why do girls think it will make them look appealing to guys when they badmouth other women?

At work there is a girl. She’s far more attractive than me but I have a very confident, funny and kind personality. I get a long well with all the guys. She feels the need to back stab and bad mouth me to the guys. Trouble is the guys hate this and it draws their attention from her to me even more which then leads her to do it more. WTH does she think she’s gonna achieve doing this? She’s not the only girl I’ve met like this. They just ruin themselves
Why do girls think it will make them look appealing to guys when they badmouth other women?
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