I know plenty of people in plenty of countries and I can't think of one where someone wouldn't be offended or pissed off if a casual acquaintance actually asked them about their immigration status. Especially if the questioning comes from the suspicion that the person wants to marry someone to get a citizenship.
Asking about citizenship, or just general stuff like "so what brings you here" are probably ok.
Asking "are you an illegal immigrant," especially in the current context, will generally offend someone. Or, if not offend, at least make them rethink whatever potential friendship/relationship they would want to have with you.
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