...What they want isn't free speech, but rather the freedom to graft their toxic, unpopular cause (anti-Israeli bigotry) onto a genuinely popular mainstream cause (gay pride), and have taxpayers foot the bill for the operation. They're brand-association parasites, in other words.
From observing QuAIA, it's clear these are people who enjoy the theatrical act of protest.( My favourite protest chant today was "Butch! Femme! Bottom! Top! Israeli Apartheid has to stop!") It makes them feel like they are on the right side of history, and that they have some useful social function to live out as street activists now that the battle for gay rights has been decisively won...Catchy chant. I prefer this one: "Butch! Femme! Big! Lie! Support Hamas and you will die!"