I've had the same experience. There's a bright line separating people who want to learn from those who want to offload the hard work of learning onto someone else.

The latter almost always ask simple questions serially - it's obvious they're looking for a sequence of steps to follow instead of sussing out the problem on their own. They want to use your problem solving abilities instead of developing and using their own.

The former usually ask pointed and precise questions - and after they get an answer they usually go away. I say this not to be anti-social (even though I am) but to simply note they go quiet because they're actually working the problem.