I think the people in question are the ones who talk about themselves and their own lives for hours, but never show interest in others.
They're not really a stranger anymore at that point. Strangers are people around you that you have had minimal contact with and know nothing about.
What if you're meeting them for the first time? Do you like someone better if they ask about you or others, or if they just talk about themselves?
I do like them better, I just don't consider them a stranger once you've introduced yourselves.