In my experience, anti-zionism has turned into textbook Jew hatred over the last five years or so.
Steven Sizer is a case in point. He is a C of E vicar who is vociferously anti-Israel, but continually denies being an anti-semite. So I took a look at his Facebook page, and his mix of over 2,000 friends is interesting to say the least: an eclectic combination of Holocaust deniers, Jews-control-the-world conspirators, and Hamas apologists.