Though I've never had a DC deny a dream, I did recently have a DC tell me that dreams are 100% real. He made some good points:

"This is a dream, but who's to say dream aren't reality? This is all real. Right now, your brain is still sending signals to your body and itself. Your heart is beating in here, as well as in your physical body, lying in your bed. What you're seeing, hearing, feeling. What you're smelling and even tasting, is all going into your memory. Saying this dream isn't real is like saying memories aren't real. You remember going snowboarding last night, right?" (I did go snowboarding last night) "That was real, wasn't it? But all it is now is just a memory, and soon, this will just be a memory. Saying this dream isn't real is like saying everything that has ever happened isn't real, and who are you to say what is and isn't reality?"
(Excerpt from DJ)

This guy really made me think about stuff. He might've been my DG but idk. I'll have to look for him later on in my dreams. Maybe if I have a lucid tonight