They're going to learn that you can't just say antisemite to shut people up or make them scared. Words have meaning and if you disregard their meaning and use them too aggressively, they lose their meaning, as well as the power associated with them.
Back in the day, antisemite was an awful accusation which made someone look awful, literally equating them to a nazi. Nowadays it's anyone who supports palestine. So if someone calls me an antisemite these days for being against genocide and occupation of Palestine, I'm just going to laugh at them because they're a chud who can't be taken seriously.