I couldn't agree more that the vast majority of mental disorders are dreamed up by committee and phony with zero basis in science. But you won't convince me that schizophrenia, bi-polar, autism, etc aren't real diseases or disorders.
The brain is by far the most intricate, complex part of the body. And to say there are no mental disorders is to say it's the one part of the body that can't be injured, deformed, nutrient deprived, toxified, chemically altered etc. Does anyone believe that?