It could be argued and I would, that holding a placard saying I oppose Genocide and I Support PalestineAction that you are doing two things
1. Opposing Genocide
2. Showing support for a group opposing Genocide in Palestine
That's it.
What you are not saying is that you support Palestine, Hamas or you hate people of the Jewish faith or are Anti-Semetic
To portray the demonstrations as Pro-Palestians serves another purpose entirely