Your point may well be true. Antisemites will jump on any excuse to be antisemitic and this does not abrogate Israel's rights. I'm not sure that's the point being raised though. An important question might be 'does antisemitism abrogate Israel's responsibilities?' Perhaps it does. I don't know. Some people think that Israel has no responsibilities to the Palestinians or to the world, given the history of persecution. Maybe Israel has no responsibility to co-operate or to pay attention to this report because of antisemitism?
from the article: In wake of UN Gaza probe, how can Israel go to war again?