Anti-Zionism is simply a coded attack on Jews, shrouded in politics and politically correct language.
Anyone with an accurate understanding of anti-Semitism and anti-Zionism as concepts will understand they are different. One is bigotry, one is a political difference of opinion.
Because anti-Zionist and anti-Semitic rhetoric is identical, both are damaging for the Jewish community.
The same people spreading anti-Zionist thought are likely to be the same people harbouring anti-Semitic views.