you are antisemitic if you don't think the National Guard should be called up to murder peaceful student protestors

The word "antisemitism" has lost all meaning.

They're pretty explicit in talking about the word, not the concept. Nobody here is saying antisemitism, the concept, doesn't exist or isn't important, but that the signifier less and less frequently refers to the actual concept of antisemitism.

I think you might just be arguing at cross purposes. Original post was borderline a purely linguistic observation, but you're talking about the underlying phenomenon.