If a Gentile exposes Zionism, they are called "anti-semitic" which is nothing more than a smokescreen to hide the Zionists actions.
But, if a Jew is the person doing the exposing, they resort to other tactics.
First, they ignore the charges, hoping the information will not be given widespread distribution.
If the information starts reaching too many people, they ridicule the information and the persons giving the information.
If that doesn't work, their next step is character assassination. If the author or speaker hasn't been involved in sufficient scandal they are adept at fabricating scandal against the person or persons.
If none of these are effective, they are known to resort to physical attacks.
But, NEVER do they try to prove the information wrong.