There is nothing new in the claim that critics of Israel or Zionism are anti-Semites. It has long been the position of the Israeli State (certainly since 1967 and arguably earlier) that Palestinians are anti-Semitic by definition. As Zionism is Judaism, in the Alice in Wonderland thinking of the Zionists, it follows that resistance to Zionism's aim of an entirely Jewish Palestine must be founded on hatred of Judaism and of Jews. This is the technique of the thug who approaches you in a bar and asks: "Are you looking at my girlfriend?" and when you answer, "No," says, "Why not?" It is the "have you stopped beating your wife?" mentality. The only surprise is that supporters of Palestinian rights aren't automatically dubbed terrorists. On 28th June 1982, Davar published an interview with an Israeli paratrooper returned from fighting in Lebanon: "..every Palestinian is automatically a suspected terrorist, and by our definition that term is actually true,"; everyone connected with the Palestinian organisation of the economy, the health service etc was "now a terrorist by definition." Language loses all meaning when used in such deliberately tendentious and manipulative ways. Thus, "anti-Semite" is attributed to anyone who isn't a slavish adherent of Zionism. Perhaps soon dogs who bark at Zionists will be called anti-Semites. Perhaps the rain that falls on Zionists is anti-Semitic. Perhaps if a Zionist falls ill with coronavirus it will be called an anti-Semitic illness. Of course, the unwillingness to brook criticism is the sign of a guilty conscience and the method of the totalitarian. Civil society across the globe is recognising Israeli apartheid for what it is. The putatively democratic leaders who act as apologists for racism will be faced down by the people. Racism is a discredited creed. Palestine belongs to the Arabs who will share it with the Jews, if they will only cease their rejectionism.

Falsely accusing a person of anti-semitism should be as much illegal and punished by law as being a proven anti-semite.

This pro-Zionist tactic of falsely accusing anyone who is not in favour of their extreme aggressive racist/apartheid politics should come to an end and it will only be halted once their tactic of falsely accusing someone of anti-semitism is punished by law!
Anyone in favour of equal rights and justice for the Palestinians, which in my view should be no question at all as it should be a basic human right, is a threat for the Israel lobby and therefore has the chance to be smeared with lies and deceit coming from their fanatic background and supporters. Orchestrated by the (local) Israel lobby with tools like Act.IL.

Anti-semitism is wrong and should be punished by law.
Calling someone an anti-semite because one values basic human rights, or on no grounds at all should be as well.