The problem with this critique is that if we doubt tangible experiences that seem certain to us, and treat them as hallucinations, what can we say is true? Maybe the reality we are experiencing at the moment is also a dream or a hallucination?
Although it seems completely tangible to us, so do the religious experiences of those who experience them. If these can be hallucinations, then our perception of reality can also be such.
It will not help us to turn to other people and verify with them that they too see what we see, because those same people can be part of our hallucination, like the people we see in a dream.