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.
Not quite. Don't confuse criticism of Netanyahu with criticism of Israel. Many dislike Netanyahu for various reasons, but are still broadly supportive of Israeli policies.
It's going to be impossible to get reliable polling on Iran right now because Israel's going extremely authoritarian with domestic 'information warfare.' But it's fairly certain that most Israelis will oppose what's happening, once they can speak again. For instance in early 2024 Israeli decided to destroy the Iranian embassy in Syria, killing multiple generals amongst others. This led to a largely performative counter-strike by Iran. And here 74% of Israelis opposed continued escalation if it harmed security alliances. [2]
And the Israeli government decided to carry out the recent invasion when global support for Israel is already at record lows, which means it is obviously going to hurt security alliances, especially in the mid-term (double entendre intended). Search my post history and you'll find I've been notably favorable towards most Trump policies. If an election was held tomorrow I'd happily vote against him (and anybody else who supports this stupidity), a million times over, if he drags us into another forever war. And I think that corresponds to a sizable chunk of his support. People think "we" wanted out of Ukraine out of preference to Russia. In reality "we" just want the US to stop getting involved, and wasting money (to say nothing of lives), in stupid wars all around the world, period.
[1] - https://www.timesofisrael.com/69-of-israelis-54-of-coalition...
[2] - https://www.timesofisrael.com/poll-74-of-israelis-oppose-cou...