[Tozzie]

I think Sam nominated Dexter because he knows Callum doesn't like him and the not holding doors open was the best excuse he could think up at the time. If he didn't hold the door open for me, or, let it go in my face, I would mention it at the time by telling him that 'hey, thats rude' then he could give Dexter a chance to realise the error of his ways and perhaps he wouldn't do it again, obviously if he did keep doing it after being told then I would probably nominate him. I'm not quite sure why Sam didn't say something to Dexter about it if it bothered him that much.