I will if you will
It's actually a long, ahem, Jewish tradition, self-deprecating humor and just being publicly Jewish. It's sort of automatic and inbred, and to me harmless. As far as other ethnic groups not referring to themselves, I don't believe that for a second. People are too fucking uptight. Anyway, if there are a lot of Jews here, and there seem to be, and they (we) want to bond or whatever in a harmless way, what's the big deal? No one's getting hurt. As long as at the end of the day you see the big picture and similarities of everyone I don't see the harm.
Just my opinion.
Oh yeah. Tradition. I forgot about that. I don't have any so I will sit on the sidelines and wait for you to express yourself.