That comment may have been in poor taste but that ain’t antisemitism friend.
Jews normally have a strong sense of belonging and identity, and while a lot of Jews are opposed to the Israel government it’s not at all out of place for somebody with a clearly Jewish name to be biased towards the Jewish side of a conflict. You could be forgiven for thinking that.
Change the context a little bit - this is now a story about the Falklands war and somebody named “Barry Bugglesworth” is strongly on the British side. Are you surprised?
Now I’m not saying the guy was right. Generalising is inappropriate and generally not a sign of great intelligence, but it’s not antisemitism just because it’s targeted towards a Jewish person.
Antisemitism is a powerful word, let’s not wear it out.