[WCR1942]

I am not approving of Becky's behaviour and I do not particularly like the girl.
However, I wish someone would explain exactly what is meant by fake in the context of BB.
To take Becky as an example. She didn't like Conor, then she saw how the power balance in the house was and decided her longevity would be enhanced by siding with his gang. That was a real move done with quite clear reasons - how is that fake?
Maybe devious, even disloyal but why fake?