No matter how you dress it up, dreams are not real in the sense that they are imagined.
Would you go to a cinema and come out believing that what you saw was real?
We don't need to get all mystical about this. Real life has consequences that dreams do not. Try walking out in front of a real truck, and you are really dead. Do it in a dream and you wake up. If you truly mistake dreams for real life you need to be questioning your sanity. Yes, in the moment you may not be able to tell the difference, but there really is a difference.
Philosophical questions about whether all of life is a dream are all very well, but so far we can't prove any of that.

Saying that dreams are not real does not devalue them at all in my view.
They are what they are, a model of the real world that can be difficult to distinguish.