I mean, you can even say or think Trump would be better, too, if you want; it's a free country^1. But, also, I would ridicule you because you're deluded.
1 assumes you live in a free country; if in the USA, terms and conditions apply.
Cool! Do whatever you please until it comes down to the actual presidential election. Then, understand our very flawed political system has very limited options, and one is clearly significantly worse no matter what qualms you may have with the other.
I mean, the choice is between "guy who supports the current genocide" and "guy who will actively accelerate the current genocide". I guess you could protest by not voting/voting third party, but that's functionally indistinguishable from just not giving a shit.
So you agree that neither of the two options will have any effect on making things better in Palestine, good. Since that's cleared up, the choice is simple, as Trump is objectively the worst option, so voting Biden is the only reasonable move in November.