1) Paranoia - because the incomer has seen all their 'private' moments and convos. Therebye having an edge by knowing their 'gameplans' (however puny they may be).
2) A desire to get rid of the one who they see as having had an 'easy ride' to the point of their entry to the house.
3) Lack of shared experiences throughout the preceding weeks.
4) Incomers appear to be selected, by BB, for their rather unloveable characters.
5) Previously formed alliances will always 'go for' any outsider.
6) Basic Group Dynamics.
7) etc. etc. etc.
In Becki's case all the above is compounded by her inept attempts to ingratiate herself with
everyone.
Her transparently obvious 'cosying up' to all the housemates in turn allows even the dimmest housemate (take a bow Buttocks Mary) to realise that she really is being false.
Marco's definition of her as 'plastic' is right on the button.
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= Bye Bye Becki