I mean, honestly, I don't think people protesting Democrats because of the genocide were what caused Dems to lose. I honestly believe it was because the Dems refused to acknowledge that times are hard for non-billionaires. That being said, anyone who voted for trump thinking he'd be better is an absolute fool.
It may have been a factor in Michigan. Their are about 300 Arab and Muslim Americans in Michigan, an estimated 200K of which are registered to vote, and Uncommitted vote had about 100K votes in the primary, which is less than Trump's margin of victory. There's going to be a lot of nuance examining how the anti-Genocide voters might have affected the electoral map, and I'm not sure we'll ever get a straight answer.
It doesn't matter to people who share these memes, though. They don't like looking at the numbers. In their head, they have an image of a young, entitled white kid with a Genocide Joe sign who just wouldn't listen to reason. An analysis would probably show that person is more likely to be Arab or Muslim with close ties to the Palestinian community, and that knowledge would make them uncomfortable.
Sounds like the Dems should have pandered better to them then. They had a billion dollars to find out what marginal vote block would give them the edge.