I am not so sure that Derek is unaware of what he is doing and nor do I think he will be upset or surprised when he sees what he has done in the house. A person like Derek never does anything without thinking it through and weighing up the potential pro's and con's of his actions. He is very calculated in every move he makes and I feel sure that his friends will not be the kind of friends that would think any less of him for the way he has behaved.
Derek is from a different lifestlye to most of us so the way he behaves is all new to us yet it might be that his behaviour would be thought as really funny and quite sweet by people who move within his circle.
I am not sure if anything I have said makes sense but it does in my mind lol
