This is a huge amount of Whataboutism mixed with exactly the problem I mention, which is moving the definition of antisemitism and putting words in the mouth of the speaker to hit that definition.
To pass your test, which is common out there, whenever Israel is criticized we must also: prove that we care about EVERY cause in the world; acknowledge every other conflict in the world; compare against every aggressive country in the world; declare support for Israel's "right to exist" and "right to defend itself" (which are nothing by proxies for aggressive expansionism); declare our criticism is limited to certain actions; denounce every opponent of Israel to an excessive degree; and make caveats that we have Jewish friends.
This is nonsense and this is exactly the nonsense that Israeli propaganda encourages as it suppresses criticism of Israel.
Everyday people talk in generalizations about countries, people, companies, etc... in exactly the way you claim they don't. Israeli supporters especially do it all the time, especially when talking about Iran. The hypocritical double standard is incredibly obvious to anyone not blinkered by pro-Israeli and pro-Zionist propaganda or self interest.
To overlap the Israel & Jewish issues: on Israel and also antisemitism, the Overton window in the west (especially US, UK & Germany) is located well inside the pro-Israeli, pro-Jewish side of the spectrum, especially if you compare it to what you can get away with saying about Muslims, Muslim countries and people of colour. Just think about what would happen if somebody said that in order to stop Israel committing genocide they should be bombed back to the stone age. They'd not only be uproar but that person would be driven out of their job and never serve political office in the US. But that's exactly what the US president and head of the armed forces said. The uproar was very one sided.
There is a prejudice, but it's opposite to what you think it is.