So why are the housemates scared of her.
Not making sense to me.

So much for his big pals act with Gemma. Knew he was fake

He said she is entertaining and that is why she should win. I was so happy he didn't say Gemma Collins even after Rylan was pushing him how great him and Gemma were together...

Knew there was a reason he gave her immunity, glad he did!

She definitely has an agenda, possibly given to her by BB, and the others just think she is behaving irrationally at times.

He also said they all sleep until a task is in action or it is time for food..no wonder they can't sleep at night.
The cameras won't be on when they are sleeping so they are hardly under 24/7 scrutiny, as they should be in a BB situation.