Some people do hate Israel, but I don’t think that’s what’s going on with many. Israel had much of the world’s sympathy during the Six Day War (1967) and the Yom Kippur War (1973).
But in the years following, the phenomenon of white guilt began to infect many Euros, Americans, Canadians, Australians, New Zealanders, etc. Many groups that were minorities in the white majority nations began to acquire the much treasured and valuable victim status. And during the past thirty or so years, the so-called Palestinians also acquired victim status and the Israelis no longer looked like the tiny nation fighting for survival against many hostile nations.
Now Israel is a powerful nation that has won several military victories, and the Palestinians are an unsuccessful group that spends much of its time baiting Israel and seeking international sympathy. And sympathy for all recognized victim groups is a religious requirement for the left all over the world, especially the guilt-ridden, white leftist.
Plus, the rise of Islamic fundamentalism and hostility toward all things non-Muslim has also made things worse. It’s a combination of old antisemitism and the recently acquired victim status of the so-called Palestinians.
Oh really, is that why we said we couldn't find that defense agreement we had when Israel was attacked by their neighbors? You know the one where we persuaded Israel to give up land and we would defend them against attack?