Unless this guy is 80 years old, or an expert on the events that lead to the holocaust, all he is doing is screaming "hey, I have an emotional connection that biases me towards a certain viewpoint, please stop taking my views seriously!"
I don't think you're terribly wrong, but maybe we need to pay more attention when someone says "I feel a certain way, and I'd like to talk to you about it." Sometimes, we just can't help how we feel, and it's therapeutic to know that someone else listened to what you have to say. After all the emotions are on the table, then we can start constructively attacking logical fallacies and plan a best course of action. In an ideal world.
I take issue with the implication here, not that someone has an emotional connection and wants to talk about it, but with the idea that the person being Jewish matters in any shape or way on their ability to judge the situation. I am certain the "as a Jewish person" is taken as a pro for their argument, rather than as a con, and as a sign that someone needs to be comforted and brought back to "reality" from their emotions driving their thoughts.