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Think back to the start of the series and Dean was this quite fun loving guy especially during the resort task. He got along with everyone well and seemed to enjoy spending time with people he wouldn't normally mix with on the outside

And then

He becomes Ali's sounding board for all her psychobabble and all of her narcissism which he laps up like a nodding dog. She convinces him that there's a massive house divide, she convinces him that they're victims and she convinces him that the 'queer people' are at the bottom of the house hierarchy.

This makes him think that everyone else is out to get him. People like Marcello, who he previously got along with, are now 'toxic' and bigoted. He falls into a siege mentality where he thinks that Ali is the only one worth listening to and the only one worth getting along with. This makes him nasty and spiteful towards everyone else as he nurses his own self-pity. He starts lashing out at people and is utterly convinced he's in the right by doing so because Ali will justify him with her psychological theories.

Thoughts?