You really can’t. If I ask one of my Indian co-workers what part of India they are from, I’m not trying to figure out where they land in the caste system. Indian-Americans know this, and because of them now I know why someone would avoid volunteering that information. There’s no one size fits all reaction here. Maybe they are super well informed racists that know specific regional race/classism, but I think more often than not, westerners are asking it just like they’d ask favorite sports, foods, leisure activities and so on.
JPL doesn’t get enough credit. We just taken for granted that most NASA missions succeed. Space is incredibly difficult.