I Googled it in case I didn't understand it, which it seems I did. I still don't see as being very offensive (and I do mean to imply that it's somewhat offensive), though I can see how someone could be offended by it, in the same way I see how someone could be offended by what may seem like racism, even though not intended as such.
I can't see "Hasidic Jew" as being offensive in your context, however...