[Jabbles]

Usually the argument I see online is that criticism of Israel isn't necessarily anti-semitic.

But this is just straight up criticism of Jews, based on the actions of Israel. He's saying that Jews in general should atone for their inherent bloodlust.

That's not "harsh", he's picked a bad thing that some members of a group did and tried to apply it to all members of that group. In other cases we would say that's sexist or racist, and here it's anti-semitic.