for every disease there is a test or a criteria to make the diagnosis.
people with low IQ and crooked minds do not go with such criteria and keep on publishing their mentality in the form of books like that of alisina's.
the easiest way to refute such people is to go for the diagnostic criteria of the disease,and check all of them one by one.Rule out the points for which there is no such report in the authentic sources.when the major points are ruled out,the disease would be automatically ruled out.
For anything which the critic is claiming,also see whether the reports are authentic or unauthentic.99% of the points mentioned to claim the disease,are usually taken from the unauthentic sources,even like magazines.