I am Jewish also, and understand the dilemma LW is in very well. I recently left a Midwestern company that knowingly tolerates employee antisemitism, as well as racism, and sexism. I don't think the management is particularly antisemitic or racist, but tolerating it puts them in a bad light. They are definitely sexist. In the Midwest, this is apparently acceptable. In any case, I kept the fact that I am Jewish to myself, and always felt guilty/like a coward.

I would suggest LW talk to her boss about it. Since the boss has made the comments publicly in front of many people, put it in the context of being the best thing for the company. Perhaps someone in the company is Jewish, but not saying anything, as I was. The laws do not tolerate discrimination, and if someone made a complaint, it could be very expensive for the company.