There was a post a while back calling on the site to reject anti-semitism. It had a couple of examples of things that the authors suggested should automatically considered anti-semitic. Things like holocaust denial, talk about Jewish control conspiracies and accusations of dual-loyalty.
I think some tips would be helpful to people who are anti-Zionist.
First, talk about facts and actions. Jews aren't anything. They're not evil, they're not moral, they're not war criminals, they're not better than or worse than anyone else. When you say Jews are __, you've already lost credibility. Jews include millions of people, all around the world. Some are Israeli, some are not. Some are Zionist, some anti. There are ultra orthodox Jews who say there should be no Jewish state until the messiah arrives. They no more monolithic than Americans or Christians or Muslims.
Instead, talk about individuals and actions. And be specific. Israelis aren't war mongers. Netanyahu is, as his push for military action in Iran over the objections of both the international community and the majority of his own cabinet shows.
Don't minimize the contribution of the Arab world, as it not only makes you sound ridiculous, but also belittles the Palestinians as a people to suggest that their actions play no role in the mess. If it's immoral for Israel's military to collectively punish the citizens of Gaza for the actions of militant groups, then it's just as immoral for Gaza militants to launch rockets at civilian targets in Israel. Is Israel's response disproportionate? I think so, I think that blockading nearly two million people, denying them aid and the free movement in and out of their land (a violation of the Rome convention on Apartheid, by the way) is disproportionate and designed to prevent peace not lay the ground work. But when they kill militants, it's a continuation of a cycle that each side has participated in too long to accuse one side of starting or being the root of it. Now of course when the Israelis use banned weapons (as they are suspected of doing in Gaza) or hit civilian targets violating their own protocols, then that action obviously can be criticized. But don't hold Israel's military to a higher standard than the Palestinian militants. Both are wrong, and as an anti-Zionist don't fall into the good combatant/bad combatant comparison. Bombs aren't seeds for peace.
Apartheid. If you're going to talk about apartheid, you need to talk about specific laws and situations. Israelis who marry Palestinians from the west bank can lose their citizenship. Israelis who marry other nationalities not only keep their citizenship but their spouse (regardless of their religion) gets citizenship. That policy disproportionately effects Israeli Arabs and was specifically designed to limit the growth of the Arab citizentry in Israel. Palestinians are denied free movement in the occupied territories. Israelis may work and travel in the Occupied Territories but Palestinian residents are prevented from working or traveling in the settlements, let alone Israel proper.
Israel allows and encourages Jewish Settlers to move into the occupied territories in order to strength their claim to land that they occupied militarily, and as a part of effecting demographic change to justify annexation. That's a violation of international law.
Last, suggestions that the Jews should leave Israel. I'm anti-Zionist. I think it's laughable that we're encouraging the creation and growth of a theocracy. It may be a democracy, if you only look at the pre-67 borders, but it's still a theocracy. It has a state religion. It has laws that favor the Jewish religion over and to the exclusion of other religions. I'm against a Jewish state. Just like I'm against the theocracy in Iran, or Egypt becoming an Islamist state. But the line between anti-semitism and anti-Zionism, in my mind at least, lies in the Jews' right to be in Israel. I will support their right to be there. I personally support a one state solution, with a power sharing structure similar to Lebanon, to ensure that changing demographics do not leave them an oppressed minority. I support the end of the apartheid policies that oppress the Palestinians, denying them full participation in economic and civil life in their homeland. That's not anti-Semitic. Denying that the Jews, which includes many who have been in Israel for generations, and a significant number who were exiled from neighboring Arab countries, a right to call their ancestral land home is anti-Semitic. Helen Thomas was wrong to tell them to leave. But it's not wrong to say that Palestinians have a equal claim. Both are proud cultures with long histories and ties to the land.
Is that going to convince anyone to change their mind on the conflict? No. I hope, though, that it demonstrates they you can be anti-Zionist without being anti-Semitic. I don't think anything I said can be construed by a reasonable person as anti-Semitic. There's definitely plenty of it that can be debated, and has been, ad naseum, but the point is that a debate can occur on the facts and realities, without resorting to either anti-semitism or reflexive accusations of anti-semitism.
11:23 AM PT: I stand corrected, theocracy is the wrong word to use. I stand by the contention that Israel can't be classified as a secular democracy. While many people will say that the laws treating Jews different than non-Jews in Israel are a reflection of ethnicity, the fact is that Israel considers itself a Jewish state and defines who is a Jew by religious law not just lineage.