Basically, Queers for Palestine started out as the slogan for QUIT, Queers United Against Israeli Terrorism. This in turn was a spin off from
LAGAI, Lesbians And Gays Against Intervention, originally US intervention in Honduras, founded in the early 80s. This mirrors similar groups like
LGSM (Lesbians and Gays Support the Miners) which were essentially gay communists and left wingers who wanted to do their regular leftist activism, but have a gay splinter group to do it in, and basically nothing to do with gay interests at all. LAGAI variously opposed the ending of the gay military ban (because being in the military is bad), gay marriage (
because gays should want to destroy the nuclear family and "remake society in their own image") and
whatever else this ramble is about. Their newsletter was even called UltraViolet as the "invisible fringe" of the rainbow.
Basically, they were the exact sort of people you'd imagine chanting "Queers For Palestine" today.
However "Queers For Palestine" appears to have caught on in the 2010s outside this radical leftist space. The basic thrust of this seems to be about "
pinkwashing" aka "we like gays so we're the good guys". Critics point towards Israel's apparent practice of using
IDF soldiers as honeypots to blackmail gay Palestinians into being their spies and also raise the point that just because Tel Aviv has a Pride Parade (something Israel really pushes heavily) and they've amended their laws doesn't mean it's a-ok for them to do a genocide. I think at one point it was supposed to be brain-breaking, as in "why would they support people who want to kill them" with the answer being "do you think we should genocide everyone in Uganda too, just because they're homophones?".
It has reverted to the mean, though - anything recent seems to be even more pozzed than even the OG group was with something along the lines of "you cannot be queer without being anti-zionist" or whatever