The reaction to Adele has nothing to with her sex - look at the reaction to 'Nasty' Nick in BB1.
The comments about being "two-faced" are not to do with who she nominates but about how she's always best freinds with whoever she's alone with and hates whoever she thinks they hate or who she might be able to make them hate.
I've said in other threads that this may not be a concious thing she does but rather a 'survival tactic' she adopts in real life by being a social chamelion - changing her views to match those around her. Many people do this, but only when it's seen on TV from both sides by someone outside does it seem so obvious.
Whilst I agree that there are definate predudices in the public which seem to conspire to make it almost impossible for a woman to win, I don't think that is the reason in this case as it has already been demonstrated that this sort of behaviour is looked on badly by the public regardless of sex.
If it wasn't for the very negative way some people seem to judge Kate because of her looks I would actually have some hope that she could be the first female BB winner....she's enough of a "laddette" to join in with the lads, but still femine enough to get on with most of the girls....somehow shes seen in a really negative way outside though...mostly by females maybe? (and yes, I know I'm courting a flame for that bit!