I don't usually comment on these sorts of threads, but there seem to be several people here who do actually want to learn, so I'm commenting here.
Every time something happens in Israel, antisemitic incidents increase in many parts of the world, including the UK. This week there's been a huge increase in reported incidents. All these people saying that being anti-Israel isn't the same thing as antisemitism, yet it's clearly all interlinked because otherwise we wouldn't get this increase in hate crimes that correlate with the situation in the Middle East.
Not only do a lot of people not know the difference between anti-Zionism and antisemitism, there are actually a shocking number of people out there who don't even know the difference between Israeli citizens, and Jewish people around the world of various nationalities. I've met several people who thought that all Jewish people were Israeli. Yes, really. I'm a British citizen. As someone mentioned much earlier in the thread, there is antisemitism in the way people demand that all Jewish people around the world must explain their views on Israel, or apologise every time something happens etc. I've also met people who said that Israel is the very reason for antisemitism and no wonder people hate Jews after all that's happened - all while conveniently ignoring the fact that antisemitism has existed for thousands of years, and they never seem to find an explanation for that.
In terms of criticising Israel and its government, a lot of antisemitism comes from context and oh-so-convenient timing. So, while "Free Palestine" might not sound antisemitic in isolation, when it's deliberately painted on a bridge in the middle of Golders Green (this actually happened a few days ago), then yes it's antisemitic because it's done deliberately to antagonise.
I've been in a situation where a random bloke has walked up to me in a public place, out of nowhere, and started saying how awful it was that children were dying in Gaza. I hadn't even said anything, I was just sitting there waiting for a friend, and yet this guy had walked up to an obviously Jewish person and started talking about Gaza. This is absolutely antisemitism. I wasn't even doing anything at the time.
I've been in a situation where I walked into a room where two non-Jewish people were reading the papers, and as soon as I walked in, the woman immediately started saying to her husband how shocked she was by everything happening in Palestine that week, again apropos of nothing. They weren't even talking, but as soon as a Jewish person walked into the room, they conveniently started having a conversation about Israel. This is really not okay.
And online, a frequent occurence is that there'll be a thread about antisemitism in the UK, or an incident that happened etc, and a random person will come along and comment with "Freedom for Palestine!" when we weren't even talking about the Middle East. Again, this is antisemitic because it wasn't even the topic of conversation and you're doing the online equivalent of the things I've mentioned above.
This stuff happens all. the. time. And you know what's really sad is that I've experienced way more of this from left wing people compared to right wing. I've met a few right wing extremists and they've actually told me straight out that they don't like Jews, and much as that bothers me, at least they're more honest about it. Left wing people are far more dishonest, dressing up their antisemitism with academic rhetoric, or Palestine solidarity etc, when there's clearly antisemitism behind it because it's phrased in the most antagonistic way. As has been mentioned several times throughout this thread, a lot of antisemitic people jump on board the Free Palestine movement because it gives them an excuse to say antisemitic stuff.
Oh, and I don't usually go around correcting people's spelling online, but I've lost count of the number of people who claim to be experts in these things yet can't even spell Israel. Is-ra-el. A before E. At least get the basics right.