I understand Israel disagrees with this consensus. I understand you may disagree with this consensus. I accept that if global consensus hasn't already changed your minds, I might not, either. That is okay. Consensus doesn't require buy-in from any single particular person or country. But as a general rule of thumb, if a great majority say you're in the wrong, and you say they're all in the wrong for saying you're in the wrong, that means you're probably in the wrong, so it's worth seriously considering the possibility.
Your latter observation doesn't seem to apply here, as it seems the ICC and ICJ based their findings and rulings on laws and ethics, not politics or bias, and it doesn't seem like the laws themselves are biased against Israel in particular, either.
There's no evidence the opposition is driven by antisemitism. The large amount of jewish people who oppose the Israeli genocide of Palestinians should give a clue that judaism isn't the issue here. Russia is trying to do the same thing to Ukraine as Israel is trying to do with Palestine, and receiving equal condemnation worldwide. Only they exclaim "russophobia!" when criticized, rather than "antisemitism!"
For example, parts of international law come from UN security council resolutions, which are passed based on 9/15 security council votes, and no vetos from the 5 permanent members. The permanent members include Russia and China, and non-permanent members often include other authoritarian states, like UAE until recently. Trump may soon have authority over US votes. Do you trust these political entities as bastions of morality?