How do you deal with these people at work?

There’s this old lady whose a checker. Most the older ladies are part time semi retirees very kind and sweet. But there’s this one. She’s mean as a snake. She’s rude to customers, rude to her coworkers, she’s even rude to the managers. But they seemingly let her get away with anything. We will call her Barb (not her real name)

Barb is old. She’s bitter. She’s angry. She constantly makes mistakes. Double scans stuff, doesn’t scan stuff, doesn’t give the right cash back, the list goes on. She bags things wrong. When people complain she gets a hateful attitude.

She was pushing some karts inside the other day and hit someone with the shopping karts and she began screaming at fhem.

How do you deal with these people at work?
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