It has nothing at all to do with the shit Israel is doing in Palestine.

So, you bring up a valid point but I can only support it with a few caveats. As a person who believes in democracy, I feel that history has shown us how criticism and transparency can make or break an effective government. Sometimes, this comes from the inside and sometimes it comes from the outside. Honestly, having plenty of disdain for certain aspects of Israeli policy, I really don't mind it when people want to criticize Israel on those grounds.

However, I do mind it when people make comments which society at large would label as discriminatory, anti-Semitic or otherwise-discriminatory under the banner of "anti-Zionism". I have personally heard honest-to-goodness old school anti-Semitic comments ala "some of my best friends are Jews but Israel blah blah" or "Israel doesn't need anymore advocates because the Jews control the media". It goes on and on and I do mind these comments but have, sadly, come to expect them due to the complete lack of integrity on the part of many of Israel's detractors.

When people with honestly-valid criticism of Israel in some way stand silent and let the crazies use anti-Zionism as thinly-veiled vehicle for hate and bigotry. It also pisses me off because it swallows ideas which would otherwise spawn interesting and helpful discussion.