[Josy]

He's a good housemate but I find a lot of the things he does extremely annoying and unnecessary.

For example when Daley called him from the safe house to arrange the Charlie/Callum dinner and Callum asked him whether it was Daley or Hazel speaking on the phone, Dexter replied "I can't tell you that" for no reason at all other than to annoy Callum and it wasn't game playing or anything like that...

Not a big deal in any way at all but that's the only thing I can think of atm to explain the little things he does that annoys me sometimes.