Yes, it is usually used as a talking point against Israel which seems to indicate Israel is guilty of being the only ethnonationalist nation on earth.
I usually take it as another example of scapegoating Israel for universal concepts like war, which is a cultural tradition dating at least two millennia (scapegoating, not war)
Im not attacking Israeli ethno-nationalism. I am attacking how you see the world so exclusively through that lense. The assumption that the only cause I could care about could be some kind of anti semitic activism. When actually I think this is a problem all over the place and for the most part Israeli's are just another victim of that.
I don't think ethnonationalism is the cause for war, yes it does historically break up when you force two nations speaking different languages and separate communities in one country.
However, there are enough examples to stable nationalism being completely at peace and enough examples for transnational entities trying to aggressively add more nations to their project (USSR, prenational empires)
I usually take it as another example of scapegoating Israel for universal concepts like war, which is a cultural tradition dating at least two millennia (scapegoating, not war)