Really this debate is between dualism and realism and non-dualism and idealism.
Unfortunately, dualists and realists tend to be the most irrational bunch. Irrespective of how much evidence you provide, they never actually listen and willfully remain ignorant. Even quantum physics is plagued with this irrationality of realists and dualists, despite the fact that now hundreds of experiments have been done in quantum physics proving there is no reality and locality, realists and dualists simply can’t leg go of this precious notion of reality. The result is quantum physics is not allowed to progress just because these realists and dualists, an influencial bunch, cannot face the facts.
It is very easy to prove that there is no reality because nothing would ever exist without consciousness. This is simply a fact. In order to know any reality you must have consciousness. Whatever reality you know is dependent upon your consciousness. It you take consciousness out of the equation - reality disappears like a phantom. Like it does in the state of dreamless sleep.
It is also very easy to prove and it is accepted as a fact in neuroscience that the phenomenal reality we see is a representation. When any event takes place, it goes through several filters in our mind known as apperception, before the final picture comes to us(language filters, cognitive filters, personality filters, brain filters) In other words the phenomenal form of reality is indeed a mental creation. It is what we see after it has passed through every filter. It is very easy to prove as well, if you distort any of the filters, the reality one sees is drastically different. Take some LSD and then see what reality you get.
When the child is developing many of their language and personality filters are not developed yet, so they do not differentiate between say a toe and a foot, they see both the toe and foot as one undifferentiated entity. There are other things like object permenance, children do not believe an object is permenant as demonstrated by experiments where children observe an object pass behind a screen and they believe it has disappeared, rather than simply being behind the screen. In the formative stages as investigated by psychologists like Piaget, the child sees himself and his world as undifferentiated. Later, through language acquisition and cognitive development the child starts to differentiate the world into numerous categories, classes and sub-classes.
How we view reality is based upon several facts: language, senses and mind. It is simply a fact to say that all our perceptions are constructions or representations meditated by language, senses and mind. Anybody who oppoes this obvious fact is being irrational.
Reality is not a physical stuff. It is a mental stuff. It is a form which is constructed through processes. This is why our perception of things is known as phenomenological reality. This understanding that everything really is just mind really liberates ones understanding. You no longer look at the world as some fragmented external physical stuff “out there” with you as some internal mental stuff “in there” but rather you see everything as just a mind-stuff taking on myriad forms.
I strongly question the intelligence of somebody that cannot follow this. In short I strongly question the intelligence of the dualist and realist.