I posted this to the United Kingdom community here but for some reason it was deleted almost immediately. I'm not sure why as the mods haven't said.
I somewhat agree with the "Zionism is racism" stance. Depending on how you define Zionism, it is very akin to white nationalism: You want to create a nation exclusively for one group of people, to the detriment of everyone else. We see the genocidal approach that has resulted from this dangerous viewpoint.
Could it be that in some world Zionism could be peaceful? Maybe, maybe not. That's not the world we live in though.
I can see where the motion is coming from. That said, is it for us in the UK to say that a one-state solution is the correct one? I think that's overstepping our boundaries.
Saying genocide is unacceptable would have been enough imo. Saying Zionism is bad I think is also reasonable. I'm not sure about solutionizing from afar.