to things that people from here have posted, I'm just going to respond here. Because, well, I feel like it? Hehehe.
Subterranean wrote: ...what would you do?
How would your response differ if a basic stranger asked you compared to a friend, or depending on the expression on the person's face etc.? What if someone asked you their opinion of a third person? Consider the various scenarios, like whether you are talking to a stranger\friend about a stranger\friend, or what the person's demeanour is at the time - would you tell the third person about the coversation, and what exactly would you tell them? What if someone was about to tell you what someone else had said about you - what would you do?
Class dismissed... :P - I'll respond some other time, if I'm in the mood.
If it was a stranger I'd say, "I don't. I don't even know you." If it was a friend, then I'd tell them what I thought, and have in the past, assuming people like honesty, only to find out some people don't really appreciate it quite as much as you might think hehe. See -- I have this problem with being kind of self-centered, and I sometimes think more about how I would feel about not saying what I thought than about how the other person might feel if I do -- also because when I do try to figure out how they might feel, I'm usually wrong anyway. Trying to guess and be considerate is tiring, and hard to do. I can't read minds, and I'm not perfect, no matter how hard I try.
If they asked my opinion about a 3rd person, I'd probably say, "I don't want to talk about so-and-so," unless it was a really good friend asking, and there was good reason to say something. If they were just some random person, I'd probably say, "Why do you ask?" and might say the same to a friend.
As far as their general demeanor. . . ummm. Not sure.
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What lies behind us and what lies before us are tiny matters compared to what lies within us.