Thanks for the answer, and I’m sorry you’ve become numb to the racism. It sucks that there’s even a reason to feel a need to be.
Really, the only two times I could imagine asking someone where they were from no matter what they looked like is if they had an especially weird accent, and I would probably precede it with, “you have an interesting accent,” or if I found out we were both from the same state, so I’d be asking them where in the state. Otherwise, it’s kind of a stupid question to ask of anyone most of the time, at least in the U.S., even if you aren’t trying to be a bigot.