I am not embarrassed, how ever much you would like me to be.
free palestine is just a quick way of saying "free palestine from the river to the sea"
https://www.nationalreview.com/corner/why-free-palestine-from-the-river-to-the-sea-means-genocide-against-jews/
The phrase “Free Palestine from the river to the sea” or “From the river to the sea, Palestine will be free” may seem innocuous to those unfamiliar with the geography of the region, but in reality, it represents calls for genocide against Jews.
Those of us who follow these issues closely have recoiled whenever we hear the phrase chanted at rallies around the world, or, as was the case last night, projected in massive letters on the library of my alma mater, George Washington University. We may take it for granted that everybody else understands why these words are so alarming. But it strikes me that, to the unacquainted, saying, “Free Palestine from the river to the sea” may seem like an innocent call for people to be free. How could that be objectionable?