RebE > as never asked, are you Jewish
n0 > We should not assume he is Jewish to let him marry another Jew.
and this is how it supposed to be, as far as I know. RebE may look more Jewish than I do, as once ina while I run into gabbaim who mumble while walking – Kohen? (me – nodding no), Levi (no), Isroel?
As this last question (whether asked on purpose or without thinking) just is halakhically inappropriate, I would nod a little so that he might think I am again saying “no” and suddenly stops in his track and ponders implications. I then ask back – and why did you ask?
RebE, if you are a Kohen or a Levi, or wear a shtreimel, you may get a different treatment.
An example of the opposite, when I stayed with a Bobover friend for shabbos. When the Rebbe Z’L walked in and saw someone dressed differently, he ran to shake my hand before his followers.