Intelligence Good question. Quick answer: Sort of, perhaps, maybe. We all make these assessments. Usually we have to get to know somebody well to judge whether our assessments were right or not.
A person can make rough estimates about someone's intelligence, but which way would be best would depends on context, content, and you.
First, intelligence isn't one single aspect of thinking. There are verbal intelligence, spatial relationships/mechanical intelligence, social intelligence, visual intelligence, and so on. Some people can't look at a realistic painting and see anything except a literal picture. Maybe they lack visual intelligence, or maybe it's a bad painting.
Second, the context is critical. What time/place/activity are you interacting in? Bus stop? Bar? Classroom? Coffee shop? Very late at night, or mid morning? What are you talking about? The weather? Existentialism? An art show? a mechanical problem with your car? A ball game?
Third is you. How smart are you? How good do you think you are at assessing others, compared to how good you actually are at assessing other people?
So, you're talking with a new acquaintance in a coffee shop about a science fiction book you are reading, in which worm holes enable travelers to cross large distances in the galaxy very quickly. Your new friend is a musician and doesn't like science fiction. You think worm holes are a reality, he thinks it's kind of stupid. Which viewpoint indicates intelligence? (I don't know.)
It turns out you both play chess, a chess board is on hand, and he beats you in short order. Does that mean he is more intelligent than you? (I don't know.}
The skill needed here for you to evaluate his intelligence is "How well does he explain his objection to worm holes. Is it a knee-jerk reaction to science fiction, or does he have reasons for his opinion? Then too, how well do you explain your belief that worm holes are real? What about chess? How much chess have both of you played? If you are just learning, and he has played all his life, he would of course check mate you in short order, whether either of you were very smart or not.
If you like somebody a lot, you'll probably up-rate their intelligence and other features. If you dislike somebody, you'll probably down-rate them.
That's why intelligence testing is best done under controlled circumstances.