Pretty sure my manager is borderline crazy. Her mood is unpredictable, and she loves telling people what to do.

I work in a retail store (casual weekend job, I'm a student)

This woman makes sure I stay doing the one job I hate which is scanning customer items. And she regularly gives the job I enjoy to others instead of me, this is the job of working on the shop floor.(Even when they have less experience)

She has clear favouritism and people who somehow get along with this crazy bitch (especially beta kissases) get the nicer jobs.

I try not to talk to her at all and when I do I'm blunt and straight-faced. The thought of trying to sweeten her up sickens me.

How do you get what you want from people like this?