Somebody mentioned "river", somebody else mentioned "sea" and during various conversations the words "from", "the" and "to" were used, so the protest was deemed to have included the words "from the river to the sea" and hence was deemed antisemitic.
Uh... Palestinians, including Gazans, and both men and women, are one of the most educated populations on Earth so I'm not sure what you're talking about. If Hamas is preventing women from going to school it's clearly not working.