I wonder if what you and @Chiaseedling are seeing on this thread is mostly ignorance rather than hate. Many British people who don't have Jewish friends or know much about Judaism will draw a difference between Jews in Israel and the Israeli government. They are genuine in believing that the two can be separated, so they don't think that criticising Israel's actions against Palestine is anti-Semitic. But for Jewish people, the two are too intertwined to be separated in any meaningful sense, so criticism of the Israeli government is necessarily criticism of Jews and therefore anti-Semitic. Have I got that right? I'd like to be made aware, if not.
A PP said that they are anti-Zionist not anti-Jew, evidently not realising that the vast, vast majority of Jewish people believe in a homeland for Jews - i.e. are Zionist. That the two pretty much go hand in hand. This is a good example of someone simply not understanding, rather than necessarily being anti-Semitic.
Basically, it seems to me from reading this thread - and I could be TOTALLY wrong - but it seems to me that non-Jewish people can easily separate the Israeli state from Jewish citizens, so they don't consider any sympathy for the Palestinians to be anti-Semitic, but for Jewish people, these two things cannot be separated. And therefore any support for Palestine is necessarily anti-Semitic.
I'm just trying to understand this thread and understand each side. Apologies if anything I have written is offensive. If so, it's totally accidental and borne of ignorance, not hate.
I am deeply sorry that any Jewish person has been made to feel unsafe or unwelcome in Britain today.