Of course he was being provocative. I’m not saying he should have done anything else, but he showed up openly Jewish to those who were chanting death to Jews.
The officer may have wanted to protect him by getting him to move along. That’s tough to say. I’ve seen British police acting badly over the years, so I don’t know.
There is no such thing as "openly Jewish," unless you want to say that someone like Ilhan Omar is "openly Muslim" for wearing her headscarf, or anyone who wears a dashiki is "openly black."
-PJ