I have heard that it is anti semetic to "deny israel has a right to exist"
Which makes me curious. Is it a generally accepted premise either in law or just by people that countries have "rights"?
I think of rights as something people have.
If countries do have rights, is exisiting one of them?
The right of a state to exist is nothing but an abstraction of material reality, that the state exists as part of the social superstructure necessary to facilitate the processes of production. I think maintaining a clear difference between the state and the nation is pretty important here. Should the state of Israel exist? To someone who doesn't support the subjugation of an indigenous group of people under an ethnostate, no. And that has nothing to do with antisemitism at all.