Words evolve and adapt.
Obviously the word 'hate' as referred to a description of a feeling towards a game show contestant doesn't have the same venomous meaning as it does in real life. I mean they are BB Housemates, not violent and judgemental religious ideologists/terrorists.
I 'hated' Grace, and I still think she was a vile repulsive moose. But I certainly didn't HATE her in the real sense as she's wasn't even worth expending such strong emotions on.
So It doesn't bother me If I'm called a Hater.