[MatthewS]

I'm not sure what to make of this really. It seems that he nominated Dexter because he occasionally doesn't say thank you when the door is held open for him. Is that really the worst thing ever? I get that maybe its a little rude, but I mean, do you really require a 'thank you' every single time you hold the door open for someone?

I wonder if Callum was never a housemate, and didn't enter the house, if Sam and Dexter would have a more positive relationship. I really think that a lot of the negativity Sam has for Dexter is because of his relationship with Callum. On contrast, I don't think Dexter has any negativity towards Sam at all, even though him and Callum are best friends apparently.