Where did I say British Jews have nothing to do with Israel? All Jewish people can have anything they like to do with Israel. As can anyone else for that matter.
Just like every single other person in Britain, British Jews can define themselves, and wave any bloody flag they like WITHOUT it being an excuse for harassment, abuse, threats, violence or being killed.
They're not responsible for the actions of the israeli government, just as you are not responsible for the actions of Palestinian governments when you wave their flag either.
Moreover, they're not required to adopt your view on the actions of the Israeli government, nor anyone else's.
Not a single one of these river / sea charlatans would excuse this behaviour towards any other people, and all of us absolutely know it.
What would be very nice indeed is if people could start from the basis that they have no entitlement to decide on the political views of other people, and that we live in a liberal democracy where we do not harass, bully, demonise, stab, attack, set on fire or otherwise discriminate or attack people based on their race, religion or any country they are from, or identify with.
This movement is good old fashioned antisemitism and I use the word "liar" towards anyone who denies this very well evidenced reality.