State Dept on what is considered Antisemitism: https://www.state.gov/defining-antisemitism/
These definitions are intentionally broad and designed to censor criticism of Israel. You have more freedom to criticize the US Government than to criticize a foreign country.
> Denying the Jewish people their right to self-determination, e.g., by claiming that the existence of a State of Israel is a racist endeavor
> Applying double standards by requiring of it a behavior not expected or demanded of any other democratic nation.
> Drawing comparisons of contemporary Israeli policy to that of the Nazis.
...
Many of the examples make sense, but these four above are absurd.
(It's usually difficult to decisively prove that someone is applying a double standard, but I think here we're assuming that was somehow firmly established.)
But I could have double standards for all type of countries! I tend to hold the US at a higher standard than most countries for almost anything, and I think everyone holds Germany to a much higher standards with respect to minority rights (particularly, Jews) than other countries.
I think people overindex on Israel as "the only Jewish state", and less as "just another country". I wish we could entirely separate the identity of the Jewish people and the state of Israel at least in the discourse. It would make everything healthier.
While I think there's quite a lot of antisemitism out there, I find it questionable trying to deduce antisemitism. Explicitly expressed antisemitism itself is something else. I also find it very questionable to redefine the term that it includes deductions.