Is there a specific line of the song that you mean or do you mean the “River to the sea” title/chrorus? Just checking if there is anything I might have missed.

But besides that, calling for the end of an state is a pretty normal anarchist thing to do and something I wish for all states in general and for states like Canada, USA, Israel and similar ones in particular because of the settler colonialism happening there. While it should be obvious I also want to clarify that calling for the destruction of a state is not the same as calling for the extermination the people it rules.

Since Zionists struggle to make a persuasive argument against freedom, justice, and equality for all people throughout the land, they seek instead to attack the message and messenger. When Palestinians proclaim “from the river to the sea, Palestine will be free,” many Zionists argue that this is a Palestinian call for genocide. But as historian Maha Nassar has noted, there has never been an “official Palestinian position calling for the forced removal of Jews from Palestine.” The links between this phrase and eliminationism might be the product of “an Israeli media campaign following the 1967 war that claimed Palestinians wished to ‘throw Jews into the sea.’ ” Jewish groups such as the American Jewish Committee also claim that the slogan is antisemitic because it has been taken up by militant groups such as the Palestine Liberation Organization, the Popular Front for the Liberation of Palestine, and Hamas. But as Nassar writes, the phrase predates these uses, and has its origins as “part of a larger call to see a secular democratic state established in all of historic Palestine.”

What Does “From the River to the Sea” Really Mean? --jewishcurrents.org