In regards to the (becoming even more) common protest slogan "From the River to the Sea, Palestine will be Free". German is banning it (they have a lot of very powerful anti-hate speech / symbols laws... because, well... history...).
While I still believe many in the US who use the phrase likely think (wildly idealistically) that it means some form of Israeli's and Palestinians living in peace in those lands, it's pretty clear the meaning is otherwise in many parts of the world.
Why is this thought so idealistic? Well, just watch the Frontline documentary linked above, that was primarily about the attempts (Oslo, Camp David...) to create separated states (AKA two state solution), and that was shot down (by both sides), rather violently, and that was many years ago (and before many more reasons to create more hatred of the concept).
I have also seen interviews where protests talk of the Palestinians have the right to "self-defense". While this sound reasonable in isolation (idealistically), realistically, this is Hamas. The "Palestinians" (Hamas) form of "defense" (other then maybe shooting at IDF forces currently) has historically been launching rockets into civilian populations, blowing up civilian busses and of course raiding and murdering, all of which, most any reasonable person, would not call "defense". Revenge yes, defense....
“From the River to the Sea” – Interior Ministry bans anti-Israel slogan
...As part of the Hamas ban, the Federal Ministry of the Interior and Homeland also banned the anti-Israel slogan “From the River to the Sea, Palestine will be free” (in German: “From the River to the Sea” ), which serves as code for the The extinction of the State of Israel is known. The ban on the slogan of extermination was issued last Thursday together with the ban on the terrorist organization “Hamas” in a comprehensive decree that includes other symbols, signs and tirades that are now banned.
The demand is a supposedly peaceful demand that postulates the sovereignty and independence of the Palestinians. In fact, the slogan expresses a brutal claim to the entire area between the Jordan and the Mediterranean, which would amount to the annihilation of Israel.
(in German): https://www.welt.de/politik/deutschland/article248478522/Innenministerium-verbietet-antisemtische-Parole-From-the-River-to-the-Sea.html
Also, not likely helping their cause, Palestinians protesters did this, to a WWI memorial (in Creuse France), on Armistice Day (celebrating veterans on the day WWI ended). Commemorated as Veterans day in the US of course.