I dont mind Brian but I honestly think that would happen.
My dad loves BB but when his mates are around he'll be like 'theyve got that crap on again', and then when we point out he watches it too he'll say something like 'only because of Davina!
'
Even though he gets right into it (Marcus and Freddie were his massive favourites in BB10).
BB is already seen as a guilty pleasure show, I think that would become more apparent with Brian presenting on the main show.