Latest revelations coming on top of racism in a previous series surely point to the fact that in daily life we try to maintain small courtesies and civilities and this generally holds. The concept of Big Brother is to stoke up good TV. They do this by creating an environment that is not too good for humans (confinement, manipulation) for taste and decency to disintegrate at a rapid rate.
It's a clear recipe for TV brawls, insults, bullying, racism, tears before, during and after bedtime, spitting into people's face and so on and so on - the worst excesses of human behaviour portrayed for our enjoyment, a formula for cheap TV and lots of advertising and sponsorship revenues.
The whole programme is an affront to dignity - both that of the viewers and the poor deluded participants.