He's never been to Israel, so therefore he's never been treated badly in it.
While I do believe that he frequently lies here, that's one thing I think is true. After all, he's made the claim that he's never been to Israel quite often and consistently over the years, and has tied it into political stances that he does hold. His stances are quite static, at least when comparing them over the years, which is just proof to me that he's probably telling the truth on this one.
Now, I don't know where his criticism - or, more frequently, his hatred - of Israel and the Jews comes from specifically. We could ask him, but I don't think he tells the truth all that often so take what he says with a grain of salt. If I had to guess, based on not only what he writes here but how he writes it, I'd say that he's gotten too close to certain bigots pushing a specific narrative. He appears to be conditioned to block out the good things, and hype up negative details if not outright make them up. Something also tells me that he doesn't have convenient access to Jewish people as well, to counteract the negative stereotypes and lies he's been fed. If he has these beliefs, then it would be no wonder that he just spends his time hating on certain people or groups, rather than posting more positively.
I think that Yoel can show him some friendly neighborhoods in Israel, though I wonder if he's so far-gone that it'll not do any good. I could as well, though I don't think we'd get along if we knew who were were online.