I don't quite get why an Israeli spy would like to get you to say something anti-semitic/anti-Israel. Would he want to blackmail you then? Did he want to make sure you are supportive of Isreal, sort of reverse-psychologically?
Several agencies of the US govt are known to deploy facial recognition monitoring of social media for known foreign agents and place calls to employers if their employees take selfies with them, in order to scare the employees that they're a) being watched and b) to make them more paranoid around unknown individuals. Even if it's a casual hang-out at a conference, the US government will nudge average people to make sure they don't associate with people on certain watch-lists if they work for a large corporation in a sensitive field.
PS: If you watch Thom Hartmann and TRNN, Mossad and the Israeli government actively sabotage BDS and nonviolent pro-Palestinian groups on American college campuses with a deep, well-coordinated campaign of dirty tricks and manipulation in order to cover up and confuse people about the Likud hard-liner apartheid state. They're well-funded and student activist groups are absolutely no match to their tactics, resourced and support from both Christian evangelicals and Likud.
The issue is complicated by Israel being a US-ally so technically it's not that much of an issue of Israeli "agents" talking to Americans.
http://www.haaretz.com/israel-news/1.720653
> "In general, Israeli society is a healthy society, and the majority of it is sane and aims for a Jewish, democratic and liberal country," Ya'alon said. "But to my great sorrow, extremist and dangerous elements have taken over Israel and the Likud Party and are shaking the foundations and threatening to hurt its residents."
http://www.haaretz.com/israel-news/1.720715
> Responding to the resignation of Defense Minister Moshe Ya'alon earlier in the day, Barak said that it "should be a red light for all of us regarding what's going on in the government."
> "Life-sustaining Zionism and the seeds of fascism cannot live together," Barak told a Channel 10 interviewer.
> Ya'alon's resignation is "the end of a chain that began with the case of the soldier who shot [a wounded Palestinian assailant to death]," Barak said. "Such incidents give us an X-ray image that is opposed to the will of the people.
> "What has happened is a hostile takeover of the Israeli government by dangerous elements. And it's just the beginning."
> To illustrate his point, Barak referred to legislation promoted by members of the coalition, including the law to lift the parliamentary immunity of Knesset members who allegedly support terrorism and a bill to impose Israeli law on Israelis living in the West Bank.
>U.N. Under-Secretary General and ESCWA Executive Secretary Rima Khalaf said the report was the “first of its type” from a U.N. body that “clearly and frankly concludes that Israel is a racist state that has established an apartheid system that persecutes the Palestinian people”.
Article points out however, that the statement does not represent the position of the UN secretariat.
There's always a middleground. Never forget that a country's government and intelligence services are not its people. Just as someone criticizing the NSA or CIA or Blackwater shouldn't be assumed to hate Americans, someone criticizing Mossad or Black Cube shouldn't be assumed to hate Israeli or Jewish people.
"Apartheid state" doesn't make it better, either.
Actually antisemitism is being against Jews, and criticism of the israeli government is about particular political and military actions of a certain set of people and a certain state.
If one doesn't have a problem with e.g. Brooklyn jews, then they are not antisemites, no matter how much they disagree with Israel (which they might even believe has no right to exist).
NSO Group, the firm mentioned in this and other articles, and firms like Black Cube (hired by Harvey Weinstein to spy on accusers) seem to be effectively running an intelligence-agency-as-a-service model. They'll deploy agents and compromise devices to discredit any potential witness, gather reconnaissance on potential stories that are being written, spread disinformation, influence policy, etc. All you have to do is give them money.
As for the motive: no idea. But this seems to be a popular tactic for discrediting people, especially recently after some people accused NSO Group of helping spy on Jamal Khashoggi (edit: and there's also at least one lawsuit). Tarring their accusers as anti-Semites is one way of dealing with bad PR. I don't know what the parent poster may have done or what their situation might be, but they or their employer may be in competition, or a feud, with some resourceful Israeli companies or individuals.
>Compromise [...] Coercion [...] Extortion