Brumilad: But Katie doesn't just dislike people, she actively tries to and in SAS' words 'poison others against [insert person]' and is a 'political animal'. She also couldn't answer him when he asked her if she was honest, she just looked coy and self satisfied instead. Also, when she got personal in retaliation it was a totally unfounded implication of too much alcohol affecting decision. Whereas when Adam said in the previous task, in response to SAS asking why Katie wasn't in the boardroom instead, that Paul couldn't bring Katie in because they were too close friends and Kristina went further and called it a 'personal relationship' whilst giving an example it was pertinent to the task failure. Yes, all three of them hence got personal in the boardroom but that doesn't make them the same - they were different situations with different contexts - and it wasn't the first time Katie and Paul's flirtation got in the way of the task, just look at the Richmond task where they wouldn't listen to their team leader, actively went against him and laughed about it like it was funny. Their behaviour would have led to failure had Adam not suggested going with the sing-o-gram idea.
Kristina is shrewd too - befriending Katie to get rid of Adam (who was probably dangerous to her because he knew about the revelation in the boardroom) and then realising she'd be against Katie after Katie found out. But at least her criticisms have a basis and she's proactive about fixing things that are going wrong, whereas Katie is just vindictive and vicious for the sake of it.