That's kind of weak... He's obviously comparing them to the character of Shylock, and the fact that he's Jewish is more of a criticism of Shakespeare being antisemitic. Trump might be antisemitic, but this isn't a very good example.
Not sure I follow. He did say Shylock right? Clearly referring to the Shakespeare character? What else could he have been referring to? Or is Shylock somehow associated with Jews otherwise?