If a stranger is rude enough to interrupt me at home, in public, or even on the phone, I feel justified in returning the rudeness with a "buzz off" attitude. Don't forget that they WANT something from you, it is their agenda, not yours, and nothing requires you to help them achieve their goal.
When I was told "don't talk to strangers" some 60 years ago, it really stuck, and to this day I just don't.
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