This is why Jews are Jews and not Christians, among many other reasons, but I don't think I ever really learned the historical reasoning for the rejection at the time of his death. Whether you believe Jesus is the son of God, he was a real person.
I just don't understand how and why exactly they didn't believe he was the son of God, and how they managed to survive for so long not believing it.
Daryl Cooper aka Martyr Made did a post that discussed this recently on his sub stack. Essentially, they're jealous as they consider themselves the chosen, but also bitter from recent losses to Rome, and the idea of forming a covenant with them was repulsive to a sect of Jewish zealots.