First the statement An anti-semite is not a person who hates Jews, it's a person whom the Jews hate is false. There are antisemites in the world, billions of them. And yes, there are a few Christian antisemites.
Yes, it’s possible the posters friend made it up, but it’s a well-known phrase. It’s used, like the canard “I can’t be an antisemite, I like Arabs”, as a way of denying the existence of anti-Semitism. IMO to defend Mel Gibson from charges of holocaust denial or antisemitism with quotes from Holocaust deniers is as stupid as the posters who defend him with Talmudic translations from hate sites. As to whether antisemitism exists, good grief Mel does and he says Holocaust denial is a sin. I’m not sure what the argument is on that score.
As to Inyoken, I’ve posted to you far more than him, and I don’t post to you much. In fact I don’t ever remember a discussion with him. He could be a Jew posting from a Yeshiva in Brooklyn, a Muslim in an internet café in Ramallah or any number of other things, as could you or I to the posters that don’t know us. Your contention that somehow we’re friends is bizarre.