Biggboss contestants are not negative. It is how the show is edited to get viewers attention.
Out of 24 hours creative team shows controversial 10 minutes on the episode that should not be used to judge a person in real life.
I myself have criticize Karan calling him spineless and toxic, but I have seen in live feed both Karan and Teja has put lot of effort to apologize, forgive, forget and move on from both sides.
I do believe in real life Karan must be much better.
Same goes for Teja being hated by viewers calling her negative. We only see edited 10 minutes in episodes. We have seen Hina Khan so positive in real life, but on season 11 she was shown negative. It was as edited version. There was a clip of Karanveer bohra where he was looking negative and a week later the original unedited version video showed different picture.
We should stop comparing a contestants behavior on the show with real life.
I say good luck to all contestants for their future.