Seeing as how Israeli government has spent decades to make antisemitism synonym to critique of Israeli policies, I'm not surprised that some people make that connection without it being explicitly mentioned.
The whole play hinged upon tragedies of the WW2 being the first thing people think about when thinking Israel, and not the crimes against humanity in Palestine.
But I digress. I'm sorry for everyone who's treated badly due to their background, and not due to their ideas.